Acoustic Survey Tabs

Summary Results

Number of Surveys

Table 1. Summary of the number of surveys undertaken in 2024, and the number of surveys examined in the estimation of spawning stock biomass (SSB) for the Atlantic herring 4VWX stock and coastal component complexes. Numbers in brackets indicate the number of surveys excluded from total biomass estimates.

Spawning Grounds Number of Surveys Notes
Offshore Banks 0
Scots Bay 11
German Bank 8
Seal Island 7
Spectacle Buoy 4
Trinity Ledge 4
Little Hope 9 6 used
Eastern Shore 5 5 used
Glace Bay 0
Total 48

Survey Dates

Table 2. Summary of completed herring acoustic surveys in 2024 with interval (days) between surveys on the same grounds, and the number of boats with acoustic systems.

Location of Survey Survey Date Interval (days) Acoustic Boats
Scots Bay #1 2024-05-05 NA 3
Scots Bay #2 2024-05-20 15 4
Scots Bay #3 2024-06-02 13 6
Scots Bay #4 2024-06-16 14 6
Scots Bay #5 2024-07-01 15 4
Scots Bay #6 2024-07-15 14 5
Scots Bay #7 2024-07-29 14 4
Scots Bay #8 2024-08-11 13 4
Scots Bay #9 2024-08-25 14 4
Scots Bay #10 2024-09-08 14 3
Scots Bay #11 2024-09-23 15 4
Trinity Ledge #1 2024-08-17 NA 1
Trinity Ledge #2 2024-08-27 10 1
Trinity Ledge #3 2024-09-09 13 1
Trinity Ledge #4 2024-09-20 11 1
Spec Buoy #1 2024-08-17 NA 1
Spec Buoy #2 2024-08-27 10 1
Spec Buoy #3 2024-09-06 10 1
Spec Buoy #4 2024-09-16 10 1
German Bank #1 2024-08-04 NA 6
German Bank #2 2024-08-18 14 6
German Bank #3 2024-09-02 15 5
German Bank #4 2024-09-15 13 6
German Bank #5 2024-09-29 14 6
German Bank #6 2024-10-20 21 6
German Bank #7 2024-11-03 14 3
Seal Island #1 2024-08-05 NA 6
Seal Island #2 2024-08-19 14 6
Seal Island #3 2024-09-03 15 5
Seal Island #4 2024-09-16 13 6
Seal Island #5 2024-09-30 14 6
Seal Island #6 2024-10-21 21 7
Seal Island #7 2024-11-04 14 2
Little Hope #1 2024-08-16 NA 4
Little Hope #2 2024-08-27 11 4
Little Hope #3 2024-09-06 10 5
Little Hope #4 2024-09-16 10 3
Little Hope #5 2024-09-26 10 3
Little Hope #6 2024-10-10 14 3
Little Hope #7 2024-10-21 11 1
Little Hope #8 2024-10-24 3 2
Little Hope #9 2024-11-02 9 3
Eastern Shore #1 2024-09-12 NA 1
Eastern Shore #2 2024-09-24 12 4
Eastern Shore #3 2024-10-04 10 3
Eastern Shore #4 2024-10-30 26 2
Eastern Shore #5 2024-11-04 5 1

SWNS/BoF Time-Series

Figure. Trends in herring SSB (adjusted for turnover) from acoustic surveys areas with 95% confidence intervals in Scots Bay (red) and German Bank (black) areas.

Figure. Acoustic index of SSB (in thousands of metric tons) (with 95% confidence intervals; black Line), the 3-year moving average (red line), the overall average since 1999 (dashed purple line), and the Limit Reference Point for the Southwest Nova Scotia/Bay of Fundy spawning component (revised 2005–2010 German Bank and Scots Bay average; dashed blue line).

Scots Bay

Summary

Table. Summary of the 2024 Scots Bay spawning ground acoustic survey data and associated biomass estimates for Main Box, North Box, and East Box areas. This summary includes both systematic and ad-hoc surveys.

Location Date Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Unadjusted Biomass (t) Standard Error (t) St. Err % Adjusted Biomass (t)
Scots Bay #1 2024-05-05 -35.5000 426 -43.74 67,094 37,035 58 67,094
Scots Bay #2 2024-05-20 -35.5000 550 -48.63 28,750 6,866 26 20,566
Scots Bay #3 2024-06-02 -35.0685 599 -51.54 61,745 3,716 28 57,220
Scots Bay #4 2024-06-16 -35.2123 540 -47.59 32,605 24,230 78 23,965
Scots Bay #5 2024-07-01 -34.9899 576 -56.25 4,682 625 14 705
Scots Bay #6 2024-07-15 -35.5000 651 -57.25 4,816 1,348 31 4,183
Scots Bay #7 2024-07-29 -35.6507 509 -47.41 33,994 10,929 32 33,327
Scots Bay #8 2024-08-11 -35.4294 517 -51.40 13,079 2,750 21 7,959
Scots Bay #9 2024-08-25 -35.4211 488 -53.04 8,459 1,976 23 6,338
Scots Bay #10 2024-09-08 -35.0591 684 -54.05 8,621 3,146 36 7,432
Scots Bay #11 2024-09-23 -35.2179 593 -54.84 6,478 1,280 20 5,427
Summary 558 -51.43 270,324 46,522 17 234,216

Area Plot

Figure. Plots of Transects and area buffer for each survey.

Length Frequency

Figure. Length distribution used for calculation of TS for the Scots Bay acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Scots Bay surveys in 2024 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2024 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Scots Bay #1 May - 5 -35.5000
Scots Bay #2 15 May - 20 -35.5000
Scots Bay #3 13 Jun - 2 19 4 70 3422 283 166 -35.0685 161 -35.0141
Scots Bay #4 14 Jun - 16 13 3 58 2420 278 166 -35.2123 170 -35.2552
Scots Bay #5 15 Jul - 1 2 7 44 375 270 148 -34.9899 166 -35.1679
Scots Bay #6 14 Jul - 15 -35.5000
Scots Bay #7 14 Jul - 29 8 3 76 1485 285 193 -35.6507 182 -35.5476
Scots Bay #8 13 Aug - 11 8 3 78 1449 280 177 -35.4294 177 -35.4294
Scots Bay #9 14 Aug - 25 4 2 45 766 275 170 -35.4211 180 -35.5135
Scots Bay #10 14 Sep - 8 2 1 24 378 265 145 -35.0591 177 -35.4410
Scots Bay #11 15 Sep - 23 3 4 88 606 274 161 -35.2179 172 -35.3137

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 Scots Bay acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 Scots Bay acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

adjusted SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 Scots Bay acoustic survey by week number. SSB values were adjusted for turnover to decrease the chance of double counting. (0) indicates that a surveyed occurred, but due to double-counting these individuals were removed.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-05-05 BP_T01 -35.5 -56.8528 38.8252 0.0384 3,118.1685
ScotsBayMainBox 2024-05-05 BP_T02 -35.5 -48.2212 37.0238 0.2940 22,754.2062
ScotsBayMainBox 2024-05-05 LM_T01 -35.5 -60.6876 43.0173 0.0143 1,289.4965
ScotsBayMainBox 2024-05-05 LM_T02 -35.5 -58.0359 47.6002 0.0239 2,374.6061
ScotsBayMainBox 2024-05-05 MS_T01 -35.5 -46.4381 37.2330 0.4408 34,306.0681
ScotsBayNorthBox 2024-05-06 MS_T02 -35.5 -56.1245 19.0482 0.0306 692.9731
ScotsBayNorthBox 2024-05-06 MS_T03 -35.5 -54.7671 17.6194 0.0452 947.2336
ScotsBayNorthBox 2024-05-06 MS_T04 -35.5 -56.2930 16.1081 0.0348 666.5989
ScotsBayNorthBox 2024-05-06 MS_T05 -35.5 -56.4145 14.5125 0.0376 648.2157
ScotsBayEastBox 2024-05-06 LM_T03 -35.5 -67.8629 16.2482 0.0012 41.1953
ScotsBayEastBox 2024-05-06 LM_T04 -35.5 -59.9396 17.8188 0.0069 255.3775
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-05-20 BP_T01 -35.5 -68.4456 42.1698 0.0040 279.1390
ScotsBayMainBox 2024-05-20 BP_T02 -35.5 -64.6858 41.9267 0.0096 663.4335
ScotsBayMainBox 2024-05-20 C1_T01 -35.5 -56.0418 37.8439 0.0778 4,855.1007
ScotsBayMainBox 2024-05-20 LM_T01 -35.5 -55.2911 44.5693 0.0785 5,771.2801
ScotsBayMainBox 2024-05-20 LM_T02 -35.5 -57.9916 49.9650 0.0376 3,098.9652
ScotsBayMainBox 2024-05-20 MS_T01 -35.5 -62.7302 35.9760 0.0175 1,040.7866
ScotsBayMainBox 2024-05-20 MS_T02 -35.5 -55.9350 39.9214 0.0756 4,976.0162
ScotsBayMainBox 2024-05-20 MS_T03 -35.5 -55.0764 41.1907 0.0893 6,063.7466
ScotsBayNorthBox 2024-05-21 C1_T02 -35.5 -56.0549 20.3328 0.0332 659.7530
ScotsBayNorthBox 2024-05-21 C1_T03 -35.5 -61.5928 19.4148 0.0097 184.3306
ScotsBayNorthBox 2024-05-21 C1_T04 -35.5 -63.6147 18.7868 0.0063 115.7183
ScotsBayNorthBox 2024-05-21 C1_T05 -35.5 -55.8841 18.2266 0.0385 686.2192
ScotsBayEastBox 2024-05-21 BP_T03 -35.5 -66.5425 16.8028 0.0030 73.8244
ScotsBayEastBox 2024-05-21 BP_T04 -35.5 -67.9131 16.2262 0.0022 53.8443
ScotsBayEastBox 2024-05-21 LM_T03 -35.5 -68.8733 15.3669 0.0019 43.1633
ScotsBayEastBox 2024-05-21 LM_T04 -35.5 -62.5566 15.0813 0.0083 184.8361
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-06-02 C1_T02 -35.0685 -72.3704 23.6466 0.0026 111.4571
ScotsBayMainBox 2024-06-02 C1_T03 -35.0685 -60.0599 43.6918 0.0235 1,897.3801
ScotsBayMainBox 2024-06-02 FM_T01 -35.0685 -55.6694 47.2195 0.0598 5,214.3413
ScotsBayMainBox 2024-06-02 FM_T02 -35.0685 -59.8730 39.8766 0.0269 1,980.7994
ScotsBayMainBox 2024-06-02 LM_T01 -35.0685 -63.2799 46.1084 0.0106 903.9781
ScotsBayMainBox 2024-06-02 LM_T02 -35.0685 -61.3118 39.1630 0.0197 1,422.2096
ScotsBayMainBox 2024-06-02 MS_T01 -35.0685 -64.1304 45.2227 0.0089 743.2046
ScotsBayMainBox 2024-06-02 MS_T02 -35.0685 -61.9779 39.1358 0.0169 1,219.9798
ScotsBayNorthBox 2024-06-02 C1_T01 -35.0685 -41.3877 10.5870 1.6988 23,079.1351
ScotsBayNorthBox 2024-06-02 LJ_T01 -35.0685 -58.7400 14.4043 0.0230 424.6082
ScotsBayNorthBox 2024-06-02 LJ_T02 -35.0685 -46.4228 15.8074 0.3569 7,239.5222
ScotsBayNorthBox 2024-06-02 LJ_T03 -35.0685 -46.2542 17.7487 0.3304 7,526.1521
ScotsBayNorthBox 2024-06-02 LJ_T04 -35.0685 -45.6422 18.5139 0.3647 8,665.0599
ScotsBayEastBox 2024-06-02 BP_T01 -35.0685 -55.9342 11.7890 0.0408 1,061.8690
ScotsBayEastBox 2024-06-02 BP_T02 -35.0685 -71.5665 13.4663 0.0010 29.0296
ScotsBayEastBox 2024-06-02 BP_T03 -35.0685 -66.1973 15.8106 0.0029 99.9453
ScotsBayEastBox 2024-06-02 BP_T04 -35.0685 -65.1881 17.6038 0.0032 126.0905
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-06-16 BP_T01 -35.2123 -63.2272 44.1800 0.0117 853.1488
ScotsBayMainBox 2024-06-16 BP_T02 -35.2123 -76.8971 38.2936 0.0006 36.6469
ScotsBayMainBox 2024-06-16 FM_T01 -35.2123 -60.4385 42.4681 0.0231 1,621.4187
ScotsBayMainBox 2024-06-16 FM_T02 -35.2123 -48.8988 37.3747 0.3748 23,113.6534
ScotsBayMainBox 2024-06-16 LJ_T01 -35.2123 -61.6056 46.3708 0.0162 1,239.3134
ScotsBayMainBox 2024-06-16 LJ_T02 -35.2123 -59.2314 40.3133 0.0322 2,140.9203
ScotsBayMainBox 2024-06-16 LM_T01 -35.2123 -61.0994 42.5736 0.0198 1,392.5427
ScotsBayMainBox 2024-06-16 LM_T02 -35.2123 -63.2020 35.8049 0.0145 858.1125
ScotsBayNorthBox 2024-06-16 LB_T01 -35.2123 -70.6916 14.3743 0.0013 24.2480
ScotsBayNorthBox 2024-06-16 LB_T02 -35.2123 -67.0126 15.7947 0.0028 56.5684
ScotsBayNorthBox 2024-06-16 LB_T03 -35.2123 -66.5827 17.7403 0.0027 62.4537
ScotsBayNorthBox 2024-06-16 LB_T04 -35.2123 -62.9611 18.9066 0.0059 143.7862
ScotsBayEastBox 2024-06-16 C1_T01 -35.2123 -66.9592 13.2063 0.0032 87.8849
ScotsBayEastBox 2024-06-16 C1_T02 -35.2123 -71.8044 14.1091 0.0010 28.7999
ScotsBayEastBox 2024-06-16 C1_T03 -35.2123 -57.2279 15.7337 0.0249 826.1216
ScotsBayEastBox 2024-06-16 C1_T04 -35.2123 -65.6343 19.2316 0.0029 119.2335
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-07-01 BP_T01 -34.9899 -65.6464 44.3502 0.0048 495.3100
ScotsBayMainBox 2024-07-01 BP_T02 -34.9899 -66.0570 35.6102 0.0054 450.6271
ScotsBayMainBox 2024-07-01 LB_T01 -34.9899 -62.8420 42.6979 0.0094 944.7472
ScotsBayMainBox 2024-07-01 LB_T02 -34.9899 -66.2764 36.4378 0.0050 428.4230
ScotsBayMainBox 2024-07-01 LM_T01 -34.9899 -61.7651 46.5148 0.0111 1,210.6083
ScotsBayMainBox 2024-07-01 LM_T02 -34.9899 -63.6598 40.2091 0.0083 782.5897
ScotsBayNorthBox 2024-07-01 C1_T01 -34.9899 -65.0222 18.5820 0.0036 78.2188
ScotsBayNorthBox 2024-07-01 C1_T02 -34.9899 -62.1844 17.7156 0.0072 150.3467
ScotsBayNorthBox 2024-07-01 C1_T03 -34.9899 -63.8319 16.2318 0.0054 102.8833
ScotsBayNorthBox 2024-07-01 C1_T04 -34.9899 -68.1399 14.5526 0.0022 38.1541
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-07-15 C1_T01 -35.5 -60.9993 48.6479 0.0196 1,836.4192
ScotsBayMainBox 2024-07-15 C1_T02 -35.5 -69.8310 41.9967 0.0030 240.3297
ScotsBayMainBox 2024-07-15 LB_T01 -35.5 -65.8251 43.0387 0.0073 604.4998
ScotsBayMainBox 2024-07-15 LB_T02 -35.5 -70.7995 36.4340 0.0027 192.2867
ScotsBayMainBox 2024-07-15 LJ_T01 -35.5 -68.3996 46.6288 0.0037 334.1516
ScotsBayMainBox 2024-07-15 LJ_T02 -35.5 -69.4927 39.4148 0.0034 259.7988
ScotsBayMainBox 2024-07-15 LM_T01 -35.5 -64.9819 44.5349 0.0086 734.0290
ScotsBayMainBox 2024-07-15 LM_T02 -35.5 -71.8019 37.8827 0.0021 152.6558
ScotsBayNorthBox 2024-07-15 BP_T01 -35.5 -61.9838 14.3936 0.0099 178.8011
ScotsBayNorthBox 2024-07-15 BP_T02 -35.5 -64.8731 15.7197 0.0047 91.9267
ScotsBayNorthBox 2024-07-15 BP_T03 -35.5 -63.2722 16.0267 0.0066 132.9007
ScotsBayNorthBox 2024-07-15 BP_T04 -35.5 -66.8859 17.2223 0.0027 57.8310
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-07-29 BP_T01 -35.6507 -52.9709 43.4137 0.1428 9,439.1920
ScotsBayMainBox 2024-07-29 BP_T02 -35.6507 -65.1345 38.0860 0.0099 573.5501
ScotsBayMainBox 2024-07-29 FM_T01 -35.6507 -53.3034 41.1135 0.1397 8,743.5356
ScotsBayMainBox 2024-07-29 FM_T02 -35.6507 -63.7907 37.3220 0.0138 781.5394
ScotsBayMainBox 2024-07-29 LJ_T01 -35.6507 -53.6004 47.1615 0.1137 8,165.5566
ScotsBayMainBox 2024-07-29 LJ_T02 -35.6507 -65.0783 41.7101 0.0092 581.0195
ScotsBayMainBox 2024-07-29 MS_T01 -35.6507 -55.6092 49.3061 0.0685 5,141.6348
ScotsBayMainBox 2024-07-29 MS_T02 -35.6507 -65.1732 36.4531 0.0102 568.4680
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-08-11 BP_T01 -35.4294 -63.2055 40.0532 0.0141 862.5349
ScotsBayMainBox 2024-08-11 BP_T02 -35.4294 -61.5732 36.2744 0.0227 1,256.0560
ScotsBayMainBox 2024-08-11 C1_T01 -35.4294 -59.7336 45.9674 0.0274 1,918.5378
ScotsBayMainBox 2024-08-11 C1_T02 -35.4294 -60.4494 39.2615 0.0272 1,626.9806
ScotsBayMainBox 2024-08-11 LM_T01 -35.4294 -63.9136 47.3701 0.0101 732.7716
ScotsBayMainBox 2024-08-11 LM_T02 -35.4294 -58.0853 41.9593 0.0438 2,804.1257
ScotsBayMainBox 2024-08-11 MS_T01 -35.4294 -64.1421 46.7739 0.0098 695.2164
ScotsBayMainBox 2024-08-11 MS_T02 -35.4294 -57.5349 41.3978 0.0504 3,182.9982
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-08-25 C1_T01 -35.4211 -64.6226 47.5627 0.0087 586.9959
ScotsBayMainBox 2024-08-25 C1_T02 -35.4211 -62.2679 43.2986 0.0165 1,009.5020
ScotsBayMainBox 2024-08-25 FM_T02 -35.4211 -63.7017 38.7812 0.0133 725.6461
ScotsBayMainBox 2024-08-25 FM_T01 -35.4211 -58.2455 41.3386 0.0437 2,548.8400
ScotsBayMainBox 2024-08-25 LJ_T01 -35.4211 -63.0895 46.1997 0.0128 835.4926
ScotsBayMainBox 2024-08-25 LJ_T02 -35.4211 -65.4753 41.5079 0.0082 482.3530
ScotsBayMainBox 2024-08-25 MS_T01 -35.4211 -60.6494 47.6514 0.0218 1,465.3969
ScotsBayMainBox 2024-08-25 MS_T02 -35.4211 -63.2507 39.6487 0.0144 805.0655
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-09-08 FM_T01 -35.0591 -57.9633 40.8114 0.0315 3,502.8404
ScotsBayMainBox 2024-09-08 FM_T02 -35.0591 -60.1309 35.0845 0.0222 2,126.4649
ScotsBayMainBox 2024-09-08 LB_T01 -35.0591 -65.6256 48.1902 0.0046 600.0529
ScotsBayMainBox 2024-09-08 LB_T02 -35.0591 -62.2901 41.4524 0.0114 1,293.4265
ScotsBayMainBox 2024-09-08 LM_T01 -35.0591 -66.3072 45.9798 0.0041 512.8991
ScotsBayMainBox 2024-09-08 LM_T02 -35.0591 -65.7314 39.1601 0.0055 585.6141
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2024-09-23 BP_T01 -35.2179 -62.9308 34.7812 0.0155 1,004.6344
ScotsBayMainBox 2024-09-23 BP_T02 -35.2179 -72.8204 22.5291 0.0025 103.0509
ScotsBayMainBox 2024-09-23 C1_T01 -35.2179 -66.0519 46.1041 0.0057 489.6658
ScotsBayMainBox 2024-09-23 C1_T02 -35.2179 -72.0942 35.9372 0.0018 121.8078
ScotsBayMainBox 2024-09-23 LJ_T01 -35.2179 -61.6325 46.8160 0.0155 1,354.6974
ScotsBayMainBox 2024-09-23 LJ_T02 -35.2179 -63.9927 39.6770 0.0106 786.7163
ScotsBayMainBox 2024-09-23 MS_T01 -35.2179 -60.9652 50.2596 0.0169 1,579.7118
ScotsBayMainBox 2024-09-23 MS_T02 -35.2179 -62.7882 42.3944 0.0131 1,038.1809

Notes

German Bank

Summary

Table. Summary of the 2024 German Bank spawning ground acoustic survey data and associated biomass estimates. Adjusted biomass numbers refer to adjustment for turnover.

Location Date Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Unadjusted Biomass (t) Standard Error (t) St. Err % Adjusted Biomass
German Bank #1 2024-08-04 -35.5000 828 -57.67 5,026 2,207 44 5,026
German Bank #2 2024-08-18 -35.5000 840 -54.20 11,333 2,173 19 10,353
German Bank #3 2024-09-02 -35.5000 831 -54.26 11,070 4,730 43 8,899
German Bank #4 2024-09-15 -35.0846 815 -50.95 21,117 9,179 43 18,363
German Bank #5 2024-09-29 -35.2085 816 -53.83 11,196 2,072 19 6,588
German Bank #6 2024-10-20 -35.5000 809 -51.79 18,989 7,804 41 17,847
German Bank #7 2024-11-03 -35.5000 896 -60.27 2,989 2,166 72 0
Summary 833 -54.71 81,719 13,642 17 67,075

Area Plot

Figure. Plots of Transects and area buffer for each survey.

Length Frequency

Figure. Length distribution used for calculation of TS for the German Bank acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Figure. Length distribution used for calculation of TS for the Scots Bay acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during German Bank surveys in 2024 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2024 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
German Bank #1 Aug - 4 -35.5000
German Bank #2 14 Aug - 18 -35.5000
German Bank #3 15 Sep - 2 -35.5000
German Bank #4 6 Sep - 8 9 5 132 1805 288 181 -35.2951 167 -35.1756
German Bank #5 7 Sep - 15 2 1 28 356 282 166 -35.0846 162 -35.0509
German Bank #6 14 Sep - 29 1 2 44 218 282 170 -35.2085 167 -35.1741
German Bank #7 21 Oct - 20 -35.5000
German Bank #8 14 Nov - 3 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 German Bank acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 German Bank acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

adjusted SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 German Bank acoustic survey by week number. SSB values were adjusted for turnover to decrease the chance of double counting. (0) indicates that a surveyed occurred, but due to double-counting these individuals were removed.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2024-08-04 C1_T01 -35.5 -69.7049 40.7256 0.0044 314.5217
German 2024-08-04 C1_T02 -35.5 -81.7908 40.9366 0.0003 19.4562
German 2024-08-04 FM_T01 -35.5 -60.8914 39.7546 0.0343 2,393.3390
German 2024-08-04 FM_T02 -35.5 -67.3759 39.0071 0.0078 537.7076
German 2024-08-04 LB_T01 -35.5 -68.2386 39.0887 0.0064 440.8375
German 2024-08-04 LB_T02 -35.5 -75.8551 38.1323 0.0011 76.3183
German 2024-08-04 LJ_T01 -35.5 -70.0337 37.1280 0.0045 291.5875
German 2024-08-04 LJ_T02 -35.5 -78.6009 37.3759 0.0006 40.5557
German 2024-08-04 LM_T01 -35.5 -70.5901 38.2892 0.0038 256.5259
German 2024-08-04 LM_T02 -35.5 -68.4474 38.4470 0.0062 420.1430
German 2024-08-04 MS_T01 -35.5 -72.2803 41.9894 0.0024 173.8239
German 2024-08-04 MS_T02 -35.5 -76.8243 40.5937 0.0009 61.0540
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2024-08-18 BP_T01 -35.5 -66.0153 42.3147 0.0097 745.6485
German 2024-08-18 BP_T02 -35.5 -66.9381 36.6102 0.0090 602.9184
German 2024-08-18 FM_T01 -35.5 -60.7531 38.4645 0.0357 2,504.6740
German 2024-08-18 FM_T02 -35.5 -62.7891 37.0674 0.0232 1,567.3255
German 2024-08-18 LB_T01 -35.5 -66.8626 38.5874 0.0087 613.4871
German 2024-08-18 LB_T02 -35.5 -63.4462 38.0630 0.0194 1,347.2329
German 2024-08-18 LJ_T01 -35.5 -65.7566 37.1204 0.0117 791.4126
German 2024-08-18 LJ_T02 -35.5 -71.0362 37.2516 0.0035 234.6615
German 2024-08-18 LM_T01 -35.5 -65.9390 37.8375 0.0110 758.8586
German 2024-08-18 LM_T02 -35.5 -69.8473 37.8355 0.0045 308.5573
German 2024-08-18 MS_T01 -35.5 -65.9407 40.0932 0.0104 758.5724
German 2024-08-18 MS_T02 -35.5 -64.3277 38.9684 0.0155 1,099.7423
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2024-09-02 BP_T01 -35.5 -66.0165 36.4761 0.0092 738.0706
German 2024-09-02 BP_T02 -35.5 -74.8712 36.7469 0.0012 96.0770
German 2024-09-02 LB_T01 -35.5 -65.8349 38.5499 0.0091 769.5874
German 2024-09-02 LB_T02 -35.5 -71.3991 38.1007 0.0026 213.7137
German 2024-09-02 LJ_T01 -35.5 -60.7467 36.8251 0.0307 2,483.5646
German 2024-09-02 LJ_T02 -35.5 -74.5397 36.9995 0.0013 103.6989
German 2024-09-02 LM_T01 -35.5 -69.1152 38.2841 0.0043 361.5949
German 2024-09-02 LM_T02 -35.5 -75.3052 37.6952 0.0011 86.9415
German 2024-09-02 MS_T01 -35.5 -57.6722 40.0739 0.0573 5,041.0272
German 2024-09-02 MS_T02 -35.5 -63.9960 39.1032 0.0137 1,175.2911
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2024-09-15 C1_T01 -35.0846 -67.1692 39.6770 0.0072 504.0888
German 2024-09-15 C1_T02 -35.0846 -69.3752 38.9441 0.0044 303.3184
German 2024-09-15 FM_T01 -35.0846 -60.3711 38.1101 0.0356 2,411.6238
German 2024-09-15 FM_T02 -35.0846 -62.7153 37.5717 0.0211 1,405.6910
German 2024-09-15 LB_T01 -35.0846 -61.3720 38.1057 0.0283 1,915.2238
German 2024-09-15 LB_T02 -35.0846 -69.1200 38.2088 0.0047 321.6825
German 2024-09-15 LJ_T01 -35.0846 -64.9421 37.3923 0.0127 841.8082
German 2024-09-15 LJ_T02 -35.0846 -70.9114 37.3236 0.0032 212.9509
German 2024-09-15 LM_T01 -35.0846 -54.2713 38.3974 0.1441 9,824.0117
German 2024-09-15 LM_T02 -35.0846 -73.9026 37.6894 0.0016 106.9449
German 2024-09-15 MS_T01 -35.0846 -60.8272 38.7233 0.0316 2,171.1988
German 2024-09-15 MS_T02 -35.0846 -63.7866 38.5662 0.0160 1,098.4157
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2024-09-29 BP_T01 -35.2085 -65.3257 36.3169 0.0122 793.9106
German 2024-09-29 BP_T02 -35.2085 -68.0974 36.6063 0.0064 419.3684
German 2024-09-29 FM_T01 -35.2085 -62.0723 37.6688 0.0248 1,679.2408
German 2024-09-29 FM_T02 -35.2085 -65.9247 37.9591 0.0101 691.6237
German 2024-09-29 LB_T01 -35.2085 -64.5384 38.2101 0.0139 951.7068
German 2024-09-29 LB_T02 -35.2085 -65.1874 37.9657 0.0120 819.5909
German 2024-09-29 LJ_T01 -35.2085 -65.0602 37.2935 0.0126 843.9476
German 2024-09-29 LJ_T02 -35.2085 -65.7728 37.0466 0.0108 716.2499
German 2024-09-29 LM_T01 -35.2085 -73.5138 37.8511 0.0018 120.4919
German 2024-09-29 LM_T02 -35.2085 -60.4968 37.6446 0.0357 2,413.5602
German 2024-09-29 MS_T01 -35.2085 -63.9318 40.5187 0.0150 1,094.3700
German 2024-09-29 MS_T02 -35.2085 -66.1800 38.9286 0.0093 652.1320
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2024-10-20 BP_T01 -35.5 -77.1700 36.3973 0.0008 55.0476
German 2024-10-20 BP_T02 -35.5 -72.5949 36.5344 0.0024 157.8516
German 2024-10-20 FM_T01 -35.5 -58.1810 38.2370 0.0638 4,361.5678
German 2024-10-20 FM_T02 -35.5 -65.9694 37.6924 0.0108 725.7711
German 2024-10-20 LB_T01 -35.5 -60.2534 37.9983 0.0398 2,706.4510
German 2024-10-20 LB_T02 -35.5 -71.0522 37.9998 0.0033 225.1742
German 2024-10-20 LJ_T01 -35.5 -68.8586 37.0189 0.0056 373.1443
German 2024-10-20 LJ_T02 -35.5 -72.7177 36.9683 0.0023 153.4493
German 2024-10-20 LM_T01 -35.5 -55.7963 38.5090 0.1097 7,552.8097
German 2024-10-20 LM_T02 -35.5 -68.9007 37.6787 0.0055 369.5426
German 2024-10-20 MS_T01 -35.5 -61.7010 38.2417 0.0284 1,939.2759
German 2024-10-20 MS_T02 -35.5 -68.9120 38.9797 0.0053 368.5848
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2024-11-03 BP_T01 -35.5 -70.5663 37.2287 0.0019 279.1015
German 2024-11-03 BP_T02 -35.5 -70.5832 37.6450 0.0019 278.0178
German 2024-11-03 LM_T01 -35.5 -71.8821 37.6329 0.0014 206.1500
German 2024-11-03 LM_T02 -35.5 -61.5498 36.7553 0.0154 2,225.4021
German 2024-11-03 MS_T01 -35.5 -Inf 38.5253 0.0000 0.0000
German 2024-11-03 MS_T02 -35.5 -Inf 39.8497 0.0000 0.0000

Notes

Seal Island

Summary

Table. Summary of the 2024 Seal Island spawning ground acoustic survey data and associated biomass estimates.

Location Date Interval (Days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Seal Island #1 2024-08-05 -35.5000 259 -44.68 31,328 14,873 47
Seal Island #2 2024-08-19 14 -35.5000 257 -52.40 5,241 1,770 34
Seal Island #3 2024-09-03 15 -35.5000 258 -54.97 2,914 565 19
Seal Island #4 2024-09-16 13 -35.0313 258 -57.28 1,538 225 15
Seal Island #5 2024-09-30 14 -35.5000 261 -52.57 5,125 753 15
Seal Island #6 2024-10-21 21 -35.5000 259 -54.13 3,543 1,154 33
Seal Island #7 2024-11-04 14 -35.5000 245 -64.28 324 103 32
Summary 257 -54.33 50,013 15,054 30

Length Frequency

Figure. Length distribution used for calculation of TS for the Seal Island acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Seal Island surveys in 2024 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2024 fish sampled for Seal Island by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Seal Island #1 Aug - 4 -35.5000
Seal Island #2 14 Aug - 18 -35.5000
Seal Island #3 15 Sep - 2 -35.5000
Seal Island #4 13 Sep - 15 2 1 26 370 280 161 -35.0313 161 -35.0313
Seal Island #5 14 Sep - 29 -35.5000
Seal Island #6 21 Oct - 20 -35.5000
Seal Island #7 14 Nov - 3 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 Seal Island acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Seal Island acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2024-08-05 C1_T03 -35.5 -71.2869 32.1554 0.0030 68.4331
SealIsland 2024-08-05 C1_T04 -35.5 -58.2436 31.1798 0.0616 1,379.0909
SealIsland 2024-08-05 FM_T03 -35.5 -69.2523 29.8775 0.0051 109.3260
SealIsland 2024-08-05 FM_T04 -35.5 -55.6193 30.2265 0.1162 2,523.6056
SealIsland 2024-08-05 LB_T03 -35.5 -48.8130 29.2836 0.5751 12,096.3344
SealIsland 2024-08-05 LB_T04 -35.5 -68.1401 29.7913 0.0066 141.2347
SealIsland 2024-08-05 LJ_T03 -35.5 -50.0117 28.3467 0.4508 9,178.7012
SealIsland 2024-08-05 LJ_T04 -35.5 -72.1693 29.2355 0.0027 55.8508
SealIsland 2024-08-05 LM_T03 -35.5 -74.1714 28.8029 0.0017 35.2218
SealIsland 2024-08-05 LM_T04 -35.5 -52.2448 28.9953 0.2635 5,488.7382
SealIsland 2024-08-05 MS_T03 -35.5 -68.3014 30.5395 0.0062 136.0879
SealIsland 2024-08-05 MS_T04 -35.5 -69.0163 32.6730 0.0049 115.4314
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2024-08-19 BP_T03 -35.5 -78.8695 28.6450 0.0006 11.8214
SealIsland 2024-08-19 BP_T04 -35.5 -68.3381 28.9404 0.0063 133.6014
SealIsland 2024-08-19 FM_T03 -35.5 -66.4524 29.5391 0.0096 206.2413
SealIsland 2024-08-19 FM_T04 -35.5 -58.3074 29.2291 0.0632 1,345.4997
SealIsland 2024-08-19 LB_T03 -35.5 -68.1976 29.1995 0.0065 137.9929
SealIsland 2024-08-19 LB_T04 -35.5 -61.9407 29.5741 0.0271 582.8374
SealIsland 2024-08-19 LJ_T03 -35.5 -73.6952 28.2633 0.0019 38.9134
SealIsland 2024-08-19 LJ_T04 -35.5 -66.5883 28.8891 0.0095 199.8901
SealIsland 2024-08-19 LM_T03 -35.5 -69.2401 29.8382 0.0050 108.5446
SealIsland 2024-08-19 LM_T04 -35.5 -58.8899 29.1525 0.0554 1,176.6136
SealIsland 2024-08-19 MS_T03 -35.5 -73.0616 30.3797 0.0020 45.0257
SealIsland 2024-08-19 MS_T04 -35.5 -58.6133 31.0853 0.0554 1,253.9742
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2024-09-03 BP_T03 -35.5 -64.4544 28.6774 0.0130 328.1828
SealIsland 2024-09-03 BP_T04 -35.5 -64.2996 27.5496 0.0140 340.0928
SealIsland 2024-09-03 LB_T03 -35.5 -64.9805 29.5027 0.0112 290.7420
SealIsland 2024-09-03 LB_T04 -35.5 -70.4800 29.6062 0.0031 81.9508
SealIsland 2024-09-03 LJ_T03 -35.5 -69.8247 28.5920 0.0038 95.2967
SealIsland 2024-09-03 LJ_T04 -35.5 -62.7065 28.7967 0.0193 490.7971
SealIsland 2024-09-03 LM_T03 -35.5 -62.2220 29.1657 0.0213 548.7255
SealIsland 2024-09-03 LM_T04 -35.5 -69.1186 29.4873 0.0043 112.1224
SealIsland 2024-09-03 MS_T03 -35.5 -68.4391 30.0631 0.0049 131.1133
SealIsland 2024-09-03 MS_T04 -35.5 -62.6710 31.2884 0.0179 494.8320
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2024-09-16 C1_T03 -35.0313 -78.2769 29.8145 0.0006 12.2200
SealIsland 2024-09-16 C1_T04 -35.0313 -66.4616 29.8448 0.0084 185.6072
SealIsland 2024-09-16 FM_T03 -35.0313 -69.9541 28.7023 0.0039 83.0503
SealIsland 2024-09-16 FM_T04 -35.0313 -66.5057 28.8091 0.0086 183.7316
SealIsland 2024-09-16 LB_T03 -35.0313 -71.8813 28.9729 0.0025 53.2869
SealIsland 2024-09-16 LB_T04 -35.0313 -67.7514 28.8273 0.0065 137.9146
SealIsland 2024-09-16 LJ_T03 -35.0313 -66.2685 28.5049 0.0092 194.0462
SealIsland 2024-09-16 LJ_T04 -35.0313 -70.2762 28.3639 0.0037 77.1135
SealIsland 2024-09-16 LM_T03 -35.0313 -68.0921 29.0189 0.0059 127.5090
SealIsland 2024-09-16 LM_T04 -35.0313 -68.0341 28.5721 0.0061 129.2235
SealIsland 2024-09-16 MS_T03 -35.0313 -68.5882 29.1372 0.0053 113.7453
SealIsland 2024-09-16 MS_T04 -35.0313 -65.3355 29.5027 0.0110 240.5492
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2024-09-30 BP_T03 -35.5 -65.0425 29.7310 0.0131 289.9107
SealIsland 2024-09-30 BP_T04 -35.5 -62.8384 28.8095 0.0224 481.5851
SealIsland 2024-09-30 FM_T03 -35.5 -66.6466 29.2748 0.0092 200.3789
SealIsland 2024-09-30 FM_T04 -35.5 -60.9530 28.6920 0.0347 743.3785
SealIsland 2024-09-30 LB_T03 -35.5 -63.3213 28.9420 0.0199 430.9078
SealIsland 2024-09-30 LB_T04 -35.5 -62.3302 29.0440 0.0250 541.3670
SealIsland 2024-09-30 LJ_T03 -35.5 -63.7054 28.2726 0.0187 394.4318
SealIsland 2024-09-30 LJ_T04 -35.5 -65.5367 28.4400 0.0122 258.7263
SealIsland 2024-09-30 LM_T03 -35.5 -66.1982 28.8493 0.0103 222.1745
SealIsland 2024-09-30 LM_T04 -35.5 -62.6657 29.2573 0.0229 501.1223
SealIsland 2024-09-30 MS_T03 -35.5 -67.1809 30.0650 0.0079 177.1830
SealIsland 2024-09-30 MS_T04 -35.5 -60.2022 30.0468 0.0394 883.6701
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2024-10-21 BP_T04 -35.5 -67.7096 26.7267 0.0077 155.4973
SealIsland 2024-10-21 Region 4 -35.5 -70.2831 24.4737 0.0047 85.9750
SealIsland 2024-10-21 FM_T03 -35.5 -58.8397 29.4892 0.0541 1,198.6972
SealIsland 2024-10-21 FM_T04 -35.5 -60.8472 29.1570 0.0345 755.0258
SealIsland 2024-10-21 LB_T03 -35.5 -70.9919 30.2242 0.0032 73.0290
SealIsland 2024-10-21 LB_T04 -35.5 -65.1735 29.0305 0.0128 278.8265
SealIsland 2024-10-21 LJ_T03 -35.5 -67.1786 27.7498 0.0084 175.7221
SealIsland 2024-10-21 LJ_T04 -35.5 -69.6478 28.3341 0.0047 99.5184
SealIsland 2024-10-21 LM_T03 -35.5 -64.4838 28.8138 0.0151 326.8131
SealIsland 2024-10-21 LM_T04 -35.5 -73.7799 28.6567 0.0018 38.4316
SealIsland 2024-10-21 MS_T03 -35.5 -66.0614 30.9408 0.0098 227.2676
SealIsland 2024-10-21 MS_T04 -35.5 -68.5543 30.7735 0.0055 128.0119
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2024-11-04 LM_T03 -35.5 -69.6084 28.1130 0.0016 95.0651
SealIsland 2024-11-04 LM_T04 -35.5 -71.7229 28.8428 0.0010 58.4215
SealIsland 2024-11-04 MS_T03 -35.5 -67.6915 30.6489 0.0023 147.8149
SealIsland 2024-11-04 MS_T04 -35.5 -75.7465 30.4264 0.0004 23.1322

Notes

Trinity Ledge

Summary

Table. Summary of the 2024 Trinity Ledge spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err % NA NA
Trinity Ledge #1 2024-08-17 -35.7572 22.4899999941037 -52.2052145556483 510 159 31 22 -52.21
Trinity Ledge #2 2024-08-27 10 -35.5497 21.6500469845207 -39.9460013248698 7,867 3,546 45 22 -39.95
Trinity Ledge #3 2024-09-09 13 -35.1126 26.0030758476602 -40.0395196523501 8,362 3,830 46 26 -40.04
Trinity Ledge #4 2024-09-20 11 -35.6084 19.3269988269823 -46.3023112370387 1,647 781 47 19 -46.30
Summary 22 -44.62 18,387 5,280 29

Length Frequency

Figure. Length distribution used for calculation of TS for the Trinity Ledge acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Trinity Ledge surveys in 2024 to determine proportion of individuals spawning for Trinity Ledge acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

### Target Strength {.tabset} Table. Summary of 2024 fish sampled for Trinity Ledge by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Trinity Ledge #1 Aug - 17 8 2 48 1429 278 169 -35.3077 173 -35.3479
Trinity Ledge #2 9 Aug - 26 23 6 144 3995 268 150 -35.1003 172 -35.3139
Trinity Ledge #3 14 Sep - 9 32 10 240 6044 255 123 -34.6631 166 -35.1464
Trinity Ledge #4 10 Sep - 19 16 5 113 2894 280 166 -35.1589 166 -35.1589

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2024Trinity Ledge acoustic surveys.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2024-08-17 DD_T01 -35.7572 -62.7070 5.3066 0.0165 45.3948
TrinityLedgeTR1 2024-08-17 DD_T02 -35.7572 -59.2610 6.0436 0.0320 100.3701
TrinityLedgeTR1 2024-08-17 DD_T03 -35.7572 -62.1132 4.8998 0.0205 52.0460
TrinityLedgeTR1 2024-08-17 DD_T04 -35.7572 -65.3307 4.9959 0.0096 24.8106
TrinityLedgeTR1 2024-08-17 DD_T05 -35.7572 -61.9176 1.5803 0.0664 54.4435
TrinityLedgeTR1 2024-08-17 DD_T06 -35.7572 -70.7492 1.6075 0.0085 7.1250
TrinityLedgeTR1 2024-08-17 DD_T07 -35.7572 -71.5578 4.6755 0.0024 5.9146
TrinityLedgeTR1 2024-08-17 DD_T08 -35.7572 -63.7412 4.4809 0.0154 35.7754
TrinityLedgeTR1 2024-08-17 DD_T09 -35.7572 -60.5487 6.2841 0.0229 74.6165
TrinityLedgeTR1 2024-08-17 DD_T10 -35.7572 -61.5314 1.6933 0.0677 59.5064
TrinityLedgeTR1 2024-08-17 DD_T11 -35.7572 -62.3273 1.7832 0.0536 49.5426
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2024-08-27 DD_T01 -35.5497 -50.0345 5.3690 0.3271 770.8806
TrinityLedgeTR1 2024-08-27 DD_T02 -35.5497 -50.5710 5.3189 0.2918 681.2895
TrinityLedgeTR1 2024-08-27 DD_T03 -35.5497 -45.8822 4.5397 1.0063 2,005.4634
TrinityLedgeTR1 2024-08-27 DD_T04 -35.5497 -44.4942 5.7135 1.1007 2,760.6906
TrinityLedgeTR1 2024-08-27 DD_T05 -35.5497 -66.9668 6.0304 0.0059 15.6226
TrinityLedgeTR1 2024-08-27 DD_T06 -35.5497 -66.1682 7.4386 0.0057 18.7763
TrinityLedgeTR1 2024-08-27 DD_T07 -35.5497 -69.0851 9.4253 0.0023 9.5923
TrinityLedgeTR1 2024-08-27 DD_T08 -35.5497 -66.4073 1.5102 0.0268 17.7707
TrinityLedgeTR1 2024-08-27 DD_T09 -35.5497 -49.4872 1.4055 1.4172 874.4153
TrinityLedgeTR1 2024-08-27 DD_T10 -35.5497 -50.4162 1.6333 0.9847 706.0202
TrinityLedgeTR1 2024-08-27 DD_T11 -35.5497 -70.5114 0.9326 0.0169 6.9070
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2024-09-09 DD_T01 -35.1126 -55.9930 8.8049 0.0611 212.3149
TrinityLedgeTR1 2024-09-09 DD_T02 -35.1126 -63.9380 6.9194 0.0125 34.0791
TrinityLedgeTR1 2024-09-09 DD_T03 -35.1126 -64.8466 5.8503 0.0120 27.6455
TrinityLedgeTR1 2024-09-09 DD_T15 -35.1126 -65.7343 2.8370 0.0201 22.5346
TrinityLedgeTR1 2024-09-09 DD_T14 -35.1126 -62.9048 2.7825 0.0394 43.2316
TrinityLedgeTR1 2024-09-09 DD_T04 -35.1126 -63.2628 5.7784 0.0175 39.8111
TrinityLedgeTR1 2024-09-09 DD_T05 -35.1126 -48.3357 6.4150 0.4889 1,237.9810
TrinityLedgeTR1 2024-09-09 DD_T06 -35.1126 -41.7651 6.3433 2.2446 5,620.4419
TrinityLedgeTR1 2024-09-09 DD_T07 -35.1126 -60.7472 6.5891 0.0273 71.0507
TrinityLedgeTR1 2024-09-09 DD_T08 -35.1126 -77.1026 1.8566 0.0022 1.6445
TrinityLedgeTR1 2024-09-09 DD_T13 -35.1126 -55.3181 2.3900 0.2629 248.0145
TrinityLedgeTR1 2024-09-09 DD_T12 -35.1126 -55.6368 2.2742 0.2567 230.4630
TrinityLedgeTR1 2024-09-09 DD_T11 -35.1126 -54.7572 2.0147 0.3548 282.2073
TrinityLedgeTR1 2024-09-09 DD_T10 -35.1126 -54.7047 1.4879 0.4863 285.6371
TrinityLedgeTR1 2024-09-09 DD_T09 -35.1126 -71.9612 3.5296 0.0039 5.3724
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2024-09-20 DD_T07 -35.6084 -73.8846 5.3449 0.0012 2.8744
TrinityLedgeTR1 2024-09-20 DD_T06 -35.6084 -80.9267 2.4579 0.0005 0.5680
TrinityLedgeTR1 2024-09-20 DD_T05 -35.6084 -82.2870 3.0281 0.0003 0.4152
TrinityLedgeTR1 2024-09-20 DD_T04 -35.6084 -69.2233 6.3282 0.0029 8.4076
TrinityLedgeTR1 2024-09-20 DD_T03 -35.6084 -48.3131 6.4412 0.3495 1,036.7829
TrinityLedgeTR1 2024-09-20 DD_T02 -35.6084 -58.8271 6.4289 0.0311 92.1057
TrinityLedgeTR1 2024-09-20 DD_T01 -35.6084 -51.4667 6.3754 0.1708 501.5712
TrinityLedgeTR1 2024-09-20 DD_T08 -35.6084 -76.4691 2.8819 0.0012 1.5852
TrinityLedgeTR1 2024-09-20 DD_T09 -35.6084 -73.7364 2.6748 0.0024 2.9742

Spectacle Buoy

Summary

Table. Summary of the 2024 Spectacle Buoy spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Spectacle Buoy #1 2024-08-17 -35.9495 39 -47.15 2,986 1,381 46
Spectacle Buoy #2 2024-08-27 10 -35.9209 42 -44.85 5,340 3,143 59
Spectacle Buoy #3 2024-09-06 10 -35.8429 37 -41.71 9,547 5,523 58
Spectacle Buoy #4 2024-09-16 10 -35.8805 28 -49.22 1,287 1,125 87
Summary 36 -45.73 19,160 6,599 34

Length Frequency

Figure. Length distribution used for calculation of TS for the Spectacle Buoy acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Spectacle Buoy surveys in 2024 to determine proportion of individuals spawning for Little Hope acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

### Target Strength {.tabset} Table. Summary of 2024 fish sampled for Spectacle Buoy by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Spectacle Buoy #1 Aug - 17 -35.5000
Spectacle Buoy #2 10 Aug - 27 2 2 51 104 290 191 -35.4714 171 -35.2967
Spectacle Buoy #3 10 Sep - 6 4 2 37 535 282 178 -35.3935 175 -35.3824
Spectacle Buoy #4 10 Sep - 16 3 1 17 450 302 206 -35.4310 168 -35.1982

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2024Spectacle Buoy acoustic surveys.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2024-08-17 DD_T01 -35.9495 -60.8597 13.7825 0.0180 127.1213
SpecBuoySP1 2024-08-17 DD_T02 -35.9495 -53.9733 12.3592 0.0980 620.6702
SpecBuoySP1 2024-08-17 DD_T03 -35.9495 -50.1657 12.2649 0.2373 1,491.4981
SpecBuoySP1 2024-08-17 DD_T04 -35.9495 -54.7036 13.1911 0.0776 524.6041
SpecBuoySP1 2024-08-17 DD_T05 -35.9495 -59.9556 12.8154 0.0238 156.5427
SpecBuoySP1 2024-08-17 DD_T06 -35.9495 -63.7663 12.4256 0.0102 65.0969
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2024-08-27 DD_T01 -35.9209 -69.8285 12.3589 0.0029 16.9529
SpecBuoySP1 2024-08-27 DD_T02 -35.9209 -59.4341 13.0162 0.0300 185.6443
SpecBuoySP1 2024-08-27 DD_T03 -35.9209 -54.2756 13.1979 0.0972 608.8871
SpecBuoySP1 2024-08-27 DD_T04 -35.9209 -46.3993 12.3618 0.6362 3,733.9033
SpecBuoySP1 2024-08-27 DD_T05 -35.9209 -55.8548 11.9729 0.0745 423.2713
SpecBuoySP1 2024-08-27 DD_T06 -35.9209 -59.5729 10.1109 0.0375 179.8056
SpecBuoySP1 2024-08-27 DD_T07 -35.9209 -59.3783 10.6227 0.0373 188.0452
SpecBuoySP1 2024-08-27 DD_T08 -35.9209 -76.6415 4.1655 0.0018 3.5314
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2024-09-06 DD_T09 -35.8429 -67.4709 3.5750 0.0155 25.3490
SpecBuoySP1 2024-09-06 DD_T08 -35.8429 -53.9792 8.3158 0.1485 566.4068
SpecBuoySP1 2024-09-06 DD_T07 -35.8429 -44.9204 8.4852 1.1721 4,560.4546
SpecBuoySP1 2024-09-06 DD_T06 -35.8429 -45.4144 9.8755 0.8988 4,070.1493
SpecBuoySP1 2024-09-06 DD_T05 -35.8429 -61.0952 10.0717 0.0238 110.0349
SpecBuoySP1 2024-09-06 DD_T04 -35.8429 -62.3181 9.9968 0.0181 83.0296
SpecBuoySP1 2024-09-06 DD_T03 -35.8429 -60.4309 9.8855 0.0283 128.2200
SpecBuoySP1 2024-09-06 DD_T02 -35.8429 -76.0936 10.5397 0.0007 3.4809
SpecBuoySP1 2024-09-06 DD_T01 -35.8429 -92.4154 9.6791 0.0000 0.0812
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2024-09-16 DD_T01 -35.8805 -74.1047 10.6378 0.0010 4.1823
SpecBuoySP1 2024-09-16 DD_T02 -35.8805 -49.3593 10.1466 0.3255 1,247.2553
SpecBuoySP1 2024-09-16 DD_T03 -35.8805 -84.3461 10.1546 0.0001 0.3956
SpecBuoySP1 2024-09-16 DD_T04 -35.8805 -69.6782 10.1729 0.0030 11.5895
SpecBuoySP1 2024-09-16 DD_T05 -35.8805 -71.8319 10.0833 0.0019 7.0582
SpecBuoySP1 2024-09-16 DD_T06 -35.8805 -73.3720 9.1288 0.0014 4.9508
SpecBuoySP1 2024-09-16 DD_T07 -35.8805 -70.3709 7.3637 0.0036 9.8807
SpecBuoySP1 2024-09-16 DD_T08 -35.8805 -77.8067 5.8865 0.0008 1.7832

Little Hope

Summary

Table. Summary of the 2024 Little Hope spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Little Hope #1 2024-08-16 -35.9495 3 -46.51 5,759 50 18
Little Hope #2 2024-08-27 11 -35.9209 2 -42.26 5,778 224 40
Little Hope #3 2024-09-06 10 -35.8429 2 -36.43 20,852 460 30
Little Hope #4 2024-09-16 10 -35.8600 18 -45.34 7,587 568 28
Little Hope #5 2024-09-26 10 -36.0139 4 -40.45 6,446 362 24
Little Hope #6 2024-10-10 14 -35.6942 5 -47.93 2,633 71 23
Little Hope #7 2024-10-24 14 -36.0444 5 -36.77 9,960 3,067 66
Summary 6 -42.24 59,013 5,268 9

Length Frequency

Figure. Length distribution used for calculation of TS for the Little Hope acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Little Hope surveys in 2024 to determine proportion of individuals spawning for Little Hope acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2024 fish sampled for Little Hope by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Little Hope #1 Aug - 16 -35.5000 -35.5000
Little Hope #2 11 Aug - 27 2 2 51 104 290 191 -35.4714 171 -35.2967
Little Hope #3 9 Sep - 5 4 2 37 535 282 178 -35.3935 175 -35.3824
Little Hope #4 10 Sep - 15 2 1 17 300 300 202 -35.4106 168 -35.1982
Little Hope #5 10 Sep - 25 6 2 31 766 300 209 -35.5644 170 -35.2590
Little Hope #6 14 Oct - 9 3 2 40 431 297 191 -35.2447 169 -35.2346
Little Hope #7 11 Oct - 20 2 2 51 289 315 232 -35.5950 168 -35.1975
Little Hope #8 4 Oct - 24 2 2 51 289 315 232 -35.5950 168 -35.1975
Little Hope #9 9 Nov - 2 2 2 36 133 290 185 -35.3341 171 -35.2751

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 Little Hope acoustic surveys.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-08-16 E8_T01 -35.9495 -60.2519 0.4174 0.1065 11.6413
LittleHopeLH1 2024-08-16 E8_T02 -35.9495 -61.5309 0.7876 0.0420 8.6717
LittleHopeLH1 2024-08-16 E8_T03 -35.9495 -60.3445 0.8641 0.0503 11.3958
LittleHopeLH1 2024-08-16 E8_T04 -35.9495 -56.8218 1.0056 0.0973 25.6456
LittleHopeLH1 2024-08-16 E8_T05 -35.9495 -59.2504 1.0872 0.0515 14.6606
LittleHopeLH1 2024-08-16 E8_T06 -35.9495 -51.6616 1.9024 0.1688 84.1474
LittleHopeLH1 2024-08-16 E8_T07 -35.9495 -53.2430 1.8338 0.1217 58.4648
LittleHopeLH1 2024-08-16 E8_T08 -35.9495 -53.7032 2.1206 0.0946 52.5870
LittleHopeLH1 2024-08-16 E8_T09 -35.9495 -61.9291 1.0591 0.0285 7.9120
LittleHopeLH1 2024-08-16 E8_T10 -35.9495 -79.2471 0.8874 0.0006 0.1467
LittleHopeLH2 2024-08-16 SH_T01 -35.9495 -50.7350 1.3077 0.2201 87.6429
LittleHopeLH2 2024-08-16 SH_T02 -35.9495 -46.1000 1.4204 0.5892 254.8089
LittleHopeLH2 2024-08-16 SH_T03 -35.9495 -47.6631 1.7023 0.3430 177.7906
LittleHopeLH2 2024-08-16 SH_T04 -35.9495 -48.5611 1.9064 0.2491 144.5788
LittleHopeLH2 2024-08-16 SH_T05 -35.9495 -53.4817 1.9185 0.0797 46.5637
LittleHopeLH2 2024-08-16 SH_T06 -35.9495 -82.6925 0.4084 0.0004 0.0558
LittleHopeLH3 2024-08-16 BT_T01 -35.9495 -56.2660 2.7048 0.1158 84.3069
LittleHopeLH3 2024-08-16 BT_T02 -35.9495 -50.3056 2.8208 0.4379 332.5846
LittleHopeLH3 2024-08-16 BT_T03 -35.9495 -49.8177 3.4457 0.4011 372.1270
LittleHopeLH3 2024-08-16 BT_T04 -35.9495 -47.7597 3.8773 0.5725 597.7095
LittleHopeLH3 2024-08-16 BT_T05 -35.9495 -48.1988 3.8795 0.5172 540.2313
LittleHopeLH3 2024-08-16 BT_T06 -35.9495 -44.5129 4.3442 1.0792 1,262.3189
LittleHopeLH3 2024-08-16 BT_T07 -35.9495 -47.2952 4.1821 0.5907 665.1791
LittleHopeLH3 2024-08-16 BT_T08 -35.9495 -55.0416 3.5106 0.1182 111.7634
LittleHopeLH3 2024-08-16 BT_T09 -35.9495 -58.3745 3.3308 0.0578 51.8816
LittleHopeLH3 2024-08-16 BT_T10 -35.9495 -81.0954 1.5828 0.0007 0.2773
LittleHopeLH4 2024-08-16 AS_T01 -35.9495 -47.8540 1.5986 0.3147 99.5380
LittleHopeLH4 2024-08-16 AS_T02 -35.9495 -45.2154 1.9986 0.4622 182.7468
LittleHopeLH4 2024-08-16 AS_T03 -35.9495 -50.2900 2.0645 0.1391 56.8049
LittleHopeLH4 2024-08-16 AS_T04 -35.9495 -51.9385 2.1391 0.0918 38.8631
LittleHopeLH5 2024-08-16 AS_T05 -35.9495 -52.9067 1.3833 0.0862 47.2226
LittleHopeLH5 2024-08-16 AS_T06 -35.9495 -44.4817 4.5370 0.1830 328.5863
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-08-27 E8_T01 -35.9209 -46.1287 1.4852 0.7153 231.8565
LittleHopeLH1 2024-08-27 E8_T02 -35.9209 -54.2315 1.8328 0.0897 35.8872
LittleHopeLH1 2024-08-27 E8_T03 -35.9209 -49.9221 1.6556 0.2679 96.8000
LittleHopeLH1 2024-08-27 E8_T04 -35.9209 -57.1760 1.6059 0.0520 18.2173
LittleHopeLH1 2024-08-27 E8_T05 -35.9209 -48.2067 1.8921 0.3479 143.6859
LittleHopeLH1 2024-08-27 E8_T06 -35.9209 -60.6888 1.5301 0.0243 8.1134
LittleHopeLH1 2024-08-27 E8_T07 -35.9209 -55.0076 1.1426 0.1204 30.0141
LittleHopeLH2 2024-08-27 SH_T01 -35.9209 -53.3861 1.0567 0.1757 74.3729
LittleHopeLH2 2024-08-27 SH_T02 -35.9209 -57.3501 1.6873 0.0442 29.8549
LittleHopeLH2 2024-08-27 SH_T03 -35.9209 -59.3901 2.5910 0.0180 18.6644
LittleHopeLH2 2024-08-27 SH_T04 -35.9209 -66.1344 3.0937 0.0032 3.9499
LittleHopeLH2 2024-08-27 SH_T05 -35.9209 -69.1090 1.9284 0.0026 1.9912
LittleHopeLH3 2024-08-27 BT_T01 -35.9209 -42.0646 0.9186 0.7711 170.4571
LittleHopeLH3 2024-08-27 BT_T02 -35.9209 -36.4129 1.0039 2.5924 626.2991
LittleHopeLH3 2024-08-27 BT_T03 -35.9209 -50.3143 0.9921 0.1068 25.5057
LittleHopeLH4 2024-08-27 AS_T01 -35.9209 -54.7910 0.7914 0.0926 15.3390
LittleHopeLH4 2024-08-27 AS_T02 -35.9209 -53.0857 1.0096 0.1075 22.7158
LittleHopeLH4 2024-08-27 AS_T03 -35.9209 -48.3723 1.1789 0.2726 67.2469
LittleHopeLH4 2024-08-27 AS_T04 -35.9209 -55.6431 1.2848 0.0469 12.6063
LittleHopeLH4 2024-08-27 AS_T05 -35.9209 -56.2270 1.3856 0.0380 11.0205
LittleHopeLH5 2024-08-27 AS_T06 -35.9209 -47.8023 2.1620 0.7301 745.7182
LittleHopeLH5 2024-08-27 AS_T07 -35.9209 -48.8378 2.2711 0.5476 587.5174
LittleHopeLH5 2024-08-27 AS_T08 -35.9209 -45.9730 2.1671 1.1100 1,136.3225
LittleHopeLH5 2024-08-27 AS_T09 -35.9209 -52.4613 2.3973 0.2252 255.0760
LittleHopeLH5 2024-08-27 AS_T10 -35.9209 -49.9992 2.6366 0.3610 449.6572
LittleHopeLH5 2024-08-27 AS_T11 -35.9209 -49.3202 3.0380 0.3663 525.7506
LittleHopeLH5 2024-08-27 AS_T12 -35.9209 -50.5834 3.1141 0.2672 393.0671
LittleHopeLH5 2024-08-27 AS_T13 -35.9209 -60.9525 3.4735 0.0220 36.1034
LittleHopeLH5 2024-08-27 AS_T14 -35.9209 -70.6684 3.0850 0.0026 3.8545
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-09-06 E8_T01 -35.8429 -45.0885 0.9569 0.9446 206.3352
LittleHopeLH1 2024-09-06 E8_T02 -35.8429 -45.2247 0.7865 1.1139 199.9648
LittleHopeLH1 2024-09-06 E8_T03 -35.8429 -40.6854 1.2891 1.9326 568.7021
LittleHopeLH1 2024-09-06 E8_T04 -35.8429 -42.3758 1.2506 1.3498 385.3408
LittleHopeLH1 2024-09-06 E8_T05 -35.8429 -47.9734 1.5330 0.3035 106.1898
LittleHopeLH1 2024-09-06 E8_T06 -35.8429 -51.5298 1.1235 0.1826 46.8213
LittleHopeLH1 2024-09-06 E8_T07 -35.8429 -70.1014 0.6585 0.0043 0.6506
LittleHopeLH2 2024-09-06 E2_T01 -35.8429 -49.1446 2.3881 0.2158 235.0488
LittleHopeLH2 2024-09-06 E2_T02 -35.8429 -46.0798 2.1951 0.4754 476.0253
LittleHopeLH2 2024-09-06 E2_T03 -35.8429 -43.5519 2.3158 0.8065 851.9719
LittleHopeLH2 2024-09-06 E2_T04 -35.8429 -51.5841 1.6326 0.1800 134.0290
LittleHopeLH2 2024-09-06 E2_T05 -35.8429 -83.5433 1.1884 0.0002 0.0854
LittleHopeLH2 2024-09-06 E2_T06 -35.8429 -78.3724 1.3009 0.0005 0.2808
LittleHopeLH3 2024-09-06 BT_T01 -35.8429 -57.3940 1.2302 0.0882 39.1739
LittleHopeLH3 2024-09-06 BT_T02 -35.8429 -50.5620 1.5222 0.3438 188.8846
LittleHopeLH3 2024-09-06 BT_T03 -35.8429 -45.1230 1.9727 0.9282 660.8459
LittleHopeLH3 2024-09-06 BT_T04 -35.8429 -42.4780 2.1827 1.5424 1,215.0585
LittleHopeLH3 2024-09-06 BT_T05 -35.8429 -42.7529 2.5893 1.2205 1,140.5436
LittleHopeLH3 2024-09-06 BT_T06 -35.8429 -45.1250 2.7474 0.6662 660.5401
LittleHopeLH3 2024-09-06 BT_T07 -35.8429 -51.0051 2.5639 0.1843 170.5634
LittleHopeLH3 2024-09-06 BT_T08 -35.8429 -56.2765 0.7049 0.1992 50.6697
LittleHopeLH4 2024-09-06 BT_T09 -35.8429 -63.7143 1.2196 0.0274 11.5717
LittleHopeLH4 2024-09-06 BT_T10 -35.8429 -54.1919 2.0790 0.1442 103.6665
LittleHopeLH4 2024-09-06 BT_T11 -35.8429 -47.6049 1.9052 0.7171 472.4307
LittleHopeLH4 2024-09-06 BT_T12 -35.8429 -46.2059 2.4998 0.7542 651.9857
LittleHopeLH4 2024-09-06 BT_T13 -35.8429 -44.0017 3.0311 1.0332 1,083.0685
LittleHopeLH4 2024-09-06 BT_T14 -35.8429 -45.9897 3.1259 0.6339 685.2549
LittleHopeLH4 2024-09-06 BT_T15 -35.8429 -50.4762 2.6062 0.2706 243.8947
LittleHopeLH4 2024-09-06 BT_T16 -35.8429 -52.8539 3.0848 0.1322 141.0696
LittleHopeLH4 2024-09-06 BT_T17 -35.8429 -59.8915 0.9453 0.0854 27.9046
LittleHopeLH5 2024-09-06 SH_T01 -35.8429 -52.5203 1.0480 0.3019 116.5214
LittleHopeLH5 2024-09-06 SH_T02 -35.8429 -52.5451 1.2689 0.2479 115.8576
LittleHopeLH5 2024-09-06 SH_T03 -35.8429 -51.1032 2.2261 0.1969 161.4820
LittleHopeLH5 2024-09-06 SH_T04 -35.8429 -52.9945 1.7831 0.1591 104.4698
LittleHopeLH5 2024-09-06 SH_T05 -35.8429 -50.4506 1.9867 0.2564 187.6623
LittleHopeLH5 2024-09-06 SH_T06 -35.8429 -50.5943 1.6974 0.2904 181.5543
LittleHopeLH5 2024-09-06 SH_T07 -35.8429 -56.0538 2.0599 0.0681 51.6483
LittleHopeLH5 2024-09-06 SH_T08 -35.8429 -52.7897 1.7783 0.1672 109.5150
LittleHopeLH5 2024-09-06 SH_T09 -35.8429 -51.0413 0.8716 0.5102 163.7994
LittleHopeLH6 2024-09-06 SH_T10 -35.8429 -56.8596 1.3147 0.0438 11.6806
LittleHopeLH6 2024-09-06 SH_T11 -35.8429 -54.2185 1.4760 0.0716 21.4573
LittleHopeLH6 2024-09-06 SH_T12 -35.8429 -43.9946 1.5758 0.7062 225.9231
LittleHopeLH6 2024-09-06 SH_T13 -35.8429 -48.6966 1.5345 0.2456 76.5176
LittleHopeLH6 2024-09-06 SH_T14 -35.8429 -61.4127 1.3704 0.0147 4.0940
LittleHopeLH7 2024-09-06 AS_T01 -35.8429 -47.2322 2.5330 0.7377 603.6131
LittleHopeLH7 2024-09-06 AS_T02 -35.8429 -43.9104 3.9172 1.0250 1,296.9965
LittleHopeLH7 2024-09-06 AS_T03 -35.8429 -42.0406 4.4181 1.3977 1,994.8682
LittleHopeLH7 2024-09-06 AS_T04 -35.8429 -41.4304 3.7965 1.8719 2,295.8024
LittleHopeLH7 2024-09-06 AS_T05 -35.8429 -48.7270 2.2207 0.5964 427.8412
LittleHopeLH7 2024-09-06 AS_T06 -35.8429 -47.3859 2.5575 0.7052 582.6231
LittleHopeLH7 2024-09-06 AS_T07 -35.8429 -49.6035 2.9484 0.3671 349.6421
LittleHopeLH7 2024-09-06 AS_T08 -35.8429 -51.8737 3.3380 0.1922 207.3061
LittleHopeLH8 2024-09-06 AS_T09 -35.8429 -48.9315 1.4242 0.3816 207.3737
LittleHopeLH8 2024-09-06 AS_T10 -35.8429 -47.1774 1.7172 0.4741 310.5687
LittleHopeLH8 2024-09-06 AS_T11 -35.8429 -50.3689 2.1314 0.1832 148.9395
LittleHopeLH8 2024-09-06 AS_T12 -35.8429 -57.5363 1.5584 0.0481 28.5938
LittleHopeLH8 2024-09-06 AS_T13 -35.8429 -53.9403 1.6054 0.1068 65.4440
LittleHopeLH8 2024-09-06 AS_T14 -35.8429 -58.3390 1.1802 0.0528 23.7683
LittleHopeLH8 2024-09-06 AS_T15 -35.8429 -59.7020 1.4517 0.0314 17.3661
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-09-16 AS_T01 -35.86 -70.7495 2.3305 0.0051 5.8345
LittleHopeLH1 2024-09-16 AS_T02 -35.86 -67.7416 2.6788 0.0089 11.6624
LittleHopeLH1 2024-09-16 AS_T03 -35.86 -61.1271 3.0034 0.0362 53.4865
LittleHopeLH1 2024-09-16 AS_T04 -35.86 -54.2294 3.2853 0.1621 261.8276
LittleHopeLH1 2024-09-16 AS_T05 -35.86 -51.0602 3.8619 0.2861 543.1689
LittleHopeLH1 2024-09-16 AS_T06 -35.86 -51.5277 3.7567 0.2641 487.7285
LittleHopeLH1 2024-09-16 AS_T07 -35.86 -52.8610 4.3363 0.1683 358.8026
LittleHopeLH1 2024-09-16 AS_T08 -35.86 -55.3694 4.2352 0.0967 201.3778
LittleHopeLH1 2024-09-16 AS_T09 -35.86 -60.4360 3.9785 0.0321 62.7117
LittleHopeLH1 2024-09-16 AS_T10 -35.86 -64.6724 3.1879 0.0151 23.6434
LittleHopeLH1 2024-09-16 AS_T11 -35.86 -65.6452 1.9376 0.0198 18.8989
LittleHopeLH2 2024-09-16 BT_T01 -35.86 -77.7711 0.9608 0.0016 0.4760
LittleHopeLH2 2024-09-16 BT_T02 -35.86 -72.1118 1.7232 0.0032 1.7520
LittleHopeLH2 2024-09-16 BT_T03 -35.86 -64.1393 1.9261 0.0181 10.9843
LittleHopeLH2 2024-09-16 BT_T04 -35.86 -60.4367 2.0617 0.0397 25.7651
LittleHopeLH2 2024-09-16 BT_T05 -35.86 -58.9755 2.1932 0.0523 36.0707
LittleHopeLH2 2024-09-16 BT_T06 -35.86 -54.9473 1.8840 0.1540 91.1966
LittleHopeLH2 2024-09-16 BT_T07 -35.86 -55.3754 2.1148 0.1243 82.6350
LittleHopeLH2 2024-09-16 BT_T08 -35.86 -56.6608 2.1104 0.0926 61.4649
LittleHopeLH2 2024-09-16 BT_T09 -35.86 -57.8831 1.8934 0.0779 46.3863
LittleHopeLH2 2024-09-16 BT_T10 -35.86 -57.6240 1.8226 0.0859 49.2386
LittleHopeLH2 2024-09-16 BT_T11 -35.86 -56.8634 1.4381 0.1298 58.6624
LittleHopeLH2 2024-09-16 BT_T12 -35.86 -60.1460 1.1741 0.0746 27.5487
LittleHopeLH2 2024-09-16 BT_T13 -35.86 -60.4441 0.8334 0.0982 25.7212
LittleHopeLH2 2024-09-16 BT_T14 -35.86 -59.4025 0.8704 0.1195 32.6927
LittleHopeLH2 2024-09-16 BT_T15 -35.86 -64.8294 0.5025 0.0593 9.3704
LittleHopeLH3 2024-09-16 BT_T16 -35.86 -56.5660 0.9413 0.1194 47.5170
LittleHopeLH3 2024-09-16 BT_T17 -35.86 -51.1836 1.5196 0.2553 164.0902
LittleHopeLH3 2024-09-16 BT_T18 -35.86 -50.3931 1.6453 0.2829 196.8487
LittleHopeLH3 2024-09-16 BT_T19 -35.86 -53.2267 1.6288 0.1488 102.5123
LittleHopeLH3 2024-09-16 BT_T20 -35.86 -53.3807 1.7463 0.1340 98.9414
LittleHopeLH3 2024-09-16 BT_T21 -35.86 -53.4199 1.9125 0.1212 98.0508
LittleHopeLH3 2024-09-16 BT_T22 -35.86 -55.2974 1.8672 0.0806 63.6359
LittleHopeLH3 2024-09-16 BT_T23 -35.86 -56.3606 1.9572 0.0602 49.8178
LittleHopeLH4 2024-09-16 E8_T01 -35.86 -53.9680 1.6320 0.1123 50.9928
LittleHopeLH4 2024-09-16 E8_T02 -35.86 -50.6722 1.7821 0.2196 108.9157
LittleHopeLH4 2024-09-16 E8_T03 -35.86 -53.4721 1.3612 0.1509 57.1619
LittleHopeLH4 2024-09-16 E8_T04 -35.86 -51.6289 1.2617 0.2489 87.3830
LittleHopeLH4 2024-09-16 E8_T05 -35.86 -53.3038 1.6631 0.1284 59.4206
LittleHopeLH4 2024-09-16 E8_T06 -35.86 -51.8336 1.8591 0.1611 83.3594
LittleHopeLH4 2024-09-16 E8_T07 -35.86 -54.2517 1.6228 0.1058 47.7682
LittleHopeLH4 2024-09-16 E8_T08 -35.86 -59.1049 0.6722 0.0835 15.6249
LittleHopeLH5 2024-09-16 E8_T09 -35.86 -56.1075 0.7908 0.2467 57.4928
LittleHopeLH5 2024-09-16 E8_T10 -35.86 -54.4661 1.1558 0.2463 83.8987
LittleHopeLH5 2024-09-16 E8_T11 -35.86 -50.9363 2.3521 0.2728 189.1207
LittleHopeLH5 2024-09-16 E8_T12 -35.86 -48.9230 2.5227 0.4044 300.6508
LittleHopeLH5 2024-09-16 E8_T13 -35.86 -50.8045 3.0446 0.2173 194.9483
LittleHopeLH5 2024-09-16 E8_T14 -35.86 -52.2095 2.8161 0.1700 141.0654
LittleHopeLH5 2024-09-16 E8_T15 -35.86 -51.4948 2.8619 0.1972 166.2987
LittleHopeLH5 2024-09-16 E8_T16 -35.86 -52.8167 2.6196 0.1589 122.6575
LittleHopeLH5 2024-09-16 E8_T17 -35.86 -53.1070 2.4874 0.1565 114.7285
LittleHopeLH6 2024-09-16 E8_T18 -35.86 -47.9341 1.8559 0.5360 327.0522
LittleHopeLH6 2024-09-16 E8_T19 -35.86 -47.5168 2.0011 0.5473 360.0363
LittleHopeLH6 2024-09-16 E8_T20 -35.86 -48.2559 2.0346 0.4540 303.6986
LittleHopeLH6 2024-09-16 E8_T21 -35.86 -49.8841 1.6204 0.3919 208.7487
LittleHopeLH6 2024-09-16 E8_T22 -35.86 -52.2858 1.7007 0.2148 120.0749
LittleHopeLH6 2024-09-16 E8_T23 -35.86 -49.2757 1.8503 0.3948 240.1369
LittleHopeLH6 2024-09-16 E8_T24 -35.86 -44.6967 2.8966 0.7238 689.2217
LittleHopeLH6 2024-09-16 E8_T25 -35.86 -56.4653 2.0786 0.0671 45.8672
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-09-26 E8_T01 -36.0139 -57.5385 0.7668 0.0940 28.8860
LittleHopeLH1 2024-09-26 E8_T02 -36.0139 -46.3692 1.4681 0.6428 378.1092
LittleHopeLH1 2024-09-26 E8_T03 -36.0139 -45.8033 2.3587 0.4558 430.7318
LittleHopeLH1 2024-09-26 E8_T04 -36.0139 -46.5658 2.0838 0.4328 361.3731
LittleHopeLH1 2024-09-26 E8_T05 -36.0139 -48.7212 2.2906 0.2397 219.9982
LittleHopeLH1 2024-09-26 E8_T06 -36.0139 -54.4093 1.2735 0.1164 59.3753
LittleHopeLH2 2024-09-26 AS_T01 -36.0139 -52.0055 1.0623 0.1344 31.3600
LittleHopeLH2 2024-09-26 AS_T02 -36.0139 -47.7597 1.4927 0.2542 83.3610
LittleHopeLH2 2024-09-26 AS_T03 -36.0139 -50.0324 1.5119 0.1487 49.3965
LittleHopeLH2 2024-09-26 AS_T04 -36.0139 -54.2808 1.6043 0.0527 18.5715
LittleHopeLH3 2024-09-26 AS_T05 -36.0139 -74.7616 0.8232 0.0015 0.2313
LittleHopeLH3 2024-09-26 AS_T06 -36.0139 -71.2577 0.9832 0.0028 0.5183
LittleHopeLH3 2024-09-26 AS_T07 -36.0139 -49.4140 0.8894 0.4680 79.2396
LittleHopeLH3 2024-09-26 AS_T08 -36.0139 -38.6735 1.3111 3.7651 939.7221
LittleHopeLH3 2024-09-26 AS_T09 -36.0139 -40.9730 1.4870 1.9550 553.4102
LittleHopeLH3 2024-09-26 AS_T10 -36.0139 -42.2153 1.7696 1.2341 415.7379
LittleHopeLH3 2024-09-26 AS_T11 -36.0139 -50.5577 1.8433 0.1735 60.8946
LittleHopeLH4 2024-09-26 E8_T01 -36.0139 -57.5385 0.7668 0.0940 28.8860
LittleHopeLH4 2024-09-26 E8_T02 -36.0139 -46.3692 1.4681 0.6428 378.1092
LittleHopeLH4 2024-09-26 E8_T03 -36.0139 -45.8033 2.3587 0.4558 430.7318
LittleHopeLH4 2024-09-26 E8_T04 -36.0139 -46.5658 2.0838 0.4328 361.3731
LittleHopeLH4 2024-09-26 E8_T05 -36.0139 -48.7212 2.2906 0.2397 219.9982
LittleHopeLH4 2024-09-26 E8_T06 -36.0139 -54.4093 1.2735 0.1164 59.3753
LittleHopeLH5 2024-09-26 SH_T04 -36.0139 -54.2230 6.8367 0.0531 451.3854
LittleHopeLH5 2024-09-26 SH_T05 -36.0139 -55.3887 5.3775 0.0516 345.1262
LittleHopeLH5 2024-09-26 SH_T06 -36.0139 -55.1492 7.1802 0.0408 364.6887
LittleHopeLH5 2024-09-26 SH_T07 -36.0139 -60.9939 4.6286 0.0165 94.9415
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-10-10 AS_T01 -35.6942 -57.0818 2.0038 0.0723 37.3121
LittleHopeLH1 2024-10-10 AS_T02 -35.6942 -54.8022 1.9582 0.1250 63.0684
LittleHopeLH1 2024-10-10 AS_T03 -35.6942 -56.2918 1.9324 0.0899 44.7560
LittleHopeLH1 2024-10-10 AS_T04 -35.6942 -57.2647 1.5978 0.0869 35.7734
LittleHopeLH1 2024-10-10 AS_T05 -35.6942 -58.8978 1.4983 0.0636 24.5614
LittleHopeLH1 2024-10-10 AS_T06 -35.6942 -56.4862 1.3999 0.1187 42.7965
LittleHopeLH1 2024-10-10 AS_T08 -35.6942 -56.6409 2.0973 0.0764 41.2988
LittleHopeLH1 2024-10-10 AS_T09 -35.6942 -65.5382 2.1974 0.0094 5.3236
LittleHopeLH1 2024-10-10 AS_T10 -35.6942 -63.5587 2.6606 0.0122 8.3977
LittleHopeLH1 2024-10-10 AS_T11 -35.6942 -67.5784 2.5870 0.0050 3.3281
LittleHopeLH2 2024-10-10 AS_T12 -35.6942 -56.3098 4.1269 0.0517 198.6780
LittleHopeLH2 2024-10-10 AS_T13 -35.6942 -57.2333 3.5576 0.0484 160.6206
LittleHopeLH2 2024-10-10 AS_T14 -35.6942 -56.5051 4.0018 0.0509 189.9434
LittleHopeLH2 2024-10-10 AS_T15 -35.6942 -61.2073 3.6521 0.0189 64.3280
LittleHopeLH2 2024-10-10 AS_T16 -35.6942 -56.4664 6.1115 0.0337 191.6439
LittleHopeLH2 2024-10-10 AS_T17 -35.6942 -68.4050 1.5042 0.0087 12.2641
LittleHopeLH2 2024-10-10 AS_T18 -35.6942 -66.1614 1.6130 0.0137 20.5587
LittleHopeLH3 2024-10-10 BT_T01 -35.6942 -64.2133 0.4415 0.0290 5.1963
LittleHopeLH3 2024-10-10 BT_T02 -35.6942 -55.5244 1.3685 0.0691 38.4227
LittleHopeLH3 2024-10-10 BT_T03 -35.6942 -51.8906 1.5428 0.1415 88.7086
LittleHopeLH3 2024-10-10 BT_T04 -35.6942 -52.7062 1.7297 0.1046 73.5194
LittleHopeLH3 2024-10-10 BT_T05 -35.6942 -51.6502 1.7467 0.1321 93.7570
LittleHopeLH3 2024-10-10 BT_T06 -35.6942 -53.0335 1.8175 0.0923 68.1837
LittleHopeLH3 2024-10-10 BT_T08 -35.6942 -61.7113 0.4456 0.0511 9.2448
LittleHopeLH4 2024-10-10 BT_T09 -35.6942 -80.8957 0.2872 0.0004 0.0240
LittleHopeLH4 2024-10-10 BT_T10 -35.6942 -67.8755 0.4896 0.0045 0.4816
LittleHopeLH4 2024-10-10 BT_T11 -35.6942 -63.6442 0.6327 0.0092 1.2760
LittleHopeLH4 2024-10-10 BT_T12 -35.6942 -42.3628 0.7976 0.9759 171.3942
LittleHopeLH4 2024-10-10 BT_T13 -35.6942 -54.4682 0.9708 0.0494 10.5548
LittleHopeLH4 2024-10-10 BT_T14 -35.6942 -63.1379 0.4365 0.0149 1.4338
LittleHopeLH5 2024-10-10 SH_T01 -35.6942 -61.7835 0.9187 0.0107 2.2189
LittleHopeLH5 2024-10-10 SH_T02 -35.6942 -58.1682 1.4961 0.0150 5.1011
LittleHopeLH5 2024-10-10 SH_T03 -35.6942 -52.1448 1.5650 0.0576 20.4175
LittleHopeLH6 2024-10-10 SH_T04 -35.6942 -54.5317 1.4813 0.0314 10.6099
LittleHopeLH6 2024-10-10 SH_T05 -35.6942 -56.1521 1.3616 0.0235 7.3059
LittleHopeLH6 2024-10-10 SH_T06 -35.6942 -57.1259 0.7149 0.0358 5.8383
LittleHopeLH7 2024-10-10 SH_T07 -35.6942 -56.2963 2.8393 0.0808 111.8353
LittleHopeLH7 2024-10-10 SH_T08 -35.6942 -56.4016 3.3277 0.0673 109.1552
LittleHopeLH7 2024-10-10 SH_T09 -35.6942 -57.1111 3.7938 0.0501 92.7043
LittleHopeLH7 2024-10-10 SH_T10 -35.6942 -56.1868 4.0233 0.0585 114.6901
LittleHopeLH7 2024-10-10 SH_T11 -35.6942 -58.6877 4.0806 0.0324 64.4815
LittleHopeLH7 2024-10-10 SH_T12 -35.6942 -57.8986 4.0892 0.0388 77.3306
LittleHopeLH7 2024-10-10 SH_T13 -35.6942 -59.7733 4.1944 0.0246 50.2206
LittleHopeLH8 2024-10-10 SH_T14 -35.6942 -57.3278 2.8302 0.0391 56.0885
LittleHopeLH8 2024-10-10 SH_T15 -35.6942 -58.7260 3.2419 0.0247 40.6492
LittleHopeLH8 2024-10-10 SH_T16 -35.6942 -57.7506 2.8034 0.0358 50.8853
LittleHopeLH8 2024-10-10 SH_T17 -35.6942 -60.9075 2.2291 0.0218 24.5981
LittleHopeLH8 2024-10-10 SH_T18 -35.6942 -58.7009 1.8609 0.0433 40.8853
LittleHopeLH8 2024-10-10 SH_T19 -35.6942 -60.5324 1.8514 0.0286 26.8176
LittleHopeLH8 2024-10-10 SH_T20 -35.6942 -63.2679 1.3022 0.0216 14.2846
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-10-21 BT_T01 -36.0444 -61.9553 0.4911 0.0134 1.5936
LittleHopeLH1 2024-10-21 BT_T02 -36.0444 -56.0878 0.8381 0.0303 6.1534
LittleHopeLH1 2024-10-21 BT_T03 -36.0444 -55.2493 1.1187 0.0276 7.4640
LittleHopeLH1 2024-10-21 BT_T04 -36.0444 -54.3398 0.1199 0.3171 9.2029
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-10-24 AS_T01 -36.0444 -69.6891 1.8464 0.0053 2.3616
LittleHopeLH1 2024-10-24 AS_T02 -36.0444 -39.6479 2.9040 3.3722 2,384.1034
LittleHopeLH1 2024-10-24 AS_T03 -36.0444 -39.9537 3.4253 2.6646 2,221.9972
LittleHopeLH1 2024-10-24 AS_T04 -36.0444 -66.5992 3.6807 0.0054 4.8105
LittleHopeLH1 2024-10-24 AS_T05 -36.0444 -70.2327 3.6672 0.0023 2.0837
LittleHopeLH1 2024-10-24 AS_T06 -36.0444 -67.6877 3.5702 0.0043 3.7440
LittleHopeLH1 2024-10-24 AS_T07 -36.0444 -66.4979 3.3581 0.0060 4.9240
LittleHopeLH2 2024-10-23 SH_T01 -36.0444 -58.3334 0.7589 0.0760 13.9276
LittleHopeLH2 2024-10-23 SH_T02 -36.0444 -54.1624 1.0024 0.1503 36.3899
LittleHopeLH2 2024-10-23 SH_T03 -36.0444 -56.5248 1.3843 0.0632 21.1222
LittleHopeLH2 2024-10-23 SH_T04 -36.0444 -53.5407 1.2916 0.1346 41.9904
LittleHopeLH2 2024-10-23 SH_T05 -36.0444 -61.0891 1.6682 0.0183 7.3843
LittleHopeLH2 2024-10-23 SH_T06 -36.0444 -55.5907 1.3843 0.0783 26.1909
LittleHopeLH2 2024-10-23 SH_T07 -36.0444 -65.6844 1.4867 0.0071 2.5632
LittleHopeLH2 2024-10-23 SH_T08 -36.0444 -63.8469 0.7908 0.0205 3.9132
LittleHopeLH3 2024-10-24 SH_T09 -36.0444 -31.3545 0.3019 28.1045 1,709.6808
LittleHopeLH3 2024-10-24 SH_T10 -36.0444 -31.2372 0.4966 17.5575 1,756.4835
LittleHopeLH3 2024-10-24 SH_T11 -36.0444 -31.3443 0.5140 16.5478 1,713.7189
LittleHopeLH3 2024-10-24 SH_T12 -36.0444 -62.7027 0.5648 0.0110 1.2534
LittleHopeLH3 2024-10-24 SH_T13 -36.0444 -63.5086 0.5987 0.0086 1.0411
LittleHopeLH3 2024-10-24 SH_T14 -36.0444 -74.5441 0.4061 0.0010 0.0820
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2024-11-02 AS_T01 -35.7836 -65.1108 1.1097 0.0220 7.0599
LittleHopeLH1 2024-11-02 AS_T02 -35.7836 -62.2888 1.1524 0.0406 13.5206
LittleHopeLH1 2024-11-02 AS_T03 -35.7836 -57.0648 1.3189 0.1180 45.0194
LittleHopeLH1 2024-11-02 AS_T04 -35.7836 -60.5042 1.5401 0.0458 20.3916
LittleHopeLH1 2024-11-02 AS_T05 -35.7836 -55.2591 1.4744 0.1599 68.2282
LittleHopeLH1 2024-11-02 AS_T06 -35.7836 -58.4001 1.8274 0.0626 33.1025
LittleHopeLH1 2024-11-02 AS_T07 -35.7836 -58.1227 1.9342 0.0631 35.2858
LittleHopeLH1 2024-11-02 AS_T08 -35.7836 -66.0406 2.0193 0.0098 5.6992
LittleHopeLH1 2024-11-02 AS_T09 -35.7836 -63.7406 2.1482 0.0156 9.6786
LittleHopeLH1 2024-11-02 AS_T10 -35.7836 -65.5887 2.0139 0.0109 6.3241
LittleHopeLH1 2024-11-02 AS_T11 -35.7836 -65.1618 1.8236 0.0132 6.9774
LittleHopeLH1 2024-11-02 AS_T12 -35.7836 -74.5122 1.6294 0.0017 0.8103
LittleHopeLH1 2024-11-02 AS_T13 -35.7836 -80.2340 0.9074 0.0008 0.2170
LittleHopeLH2 2024-11-02 SH_T01 -35.7836 -53.0160 1.8505 0.0878 75.3900
LittleHopeLH2 2024-11-02 SH_T02 -35.7836 -49.6016 2.3498 0.1518 165.4812
LittleHopeLH2 2024-11-02 SH_T03 -35.7836 -52.0600 2.3988 0.0845 93.9537
LittleHopeLH2 2024-11-02 SH_T04 -35.7836 -72.6902 1.9956 0.0009 0.8126
LittleHopeLH3 2024-11-03 SH_T05 -35.7836 -55.7404 1.0699 0.0931 48.6491
LittleHopeLH3 2024-11-03 SH_T06 -35.7836 -60.7349 0.9668 0.0326 15.4039
LittleHopeLH3 2024-11-03 SH_T07 -35.7836 -52.3350 1.4292 0.1526 106.5659
LittleHopeLH3 2024-11-03 SH_T08 -35.7836 -56.4718 1.1278 0.0746 41.1091
LittleHopeLH3 2024-11-03 SH_T09 -35.7836 -53.5970 1.7782 0.0917 79.6916
LittleHopeLH3 2024-11-03 SH_T10 -35.7836 -57.3494 2.2953 0.0300 33.5873
LittleHopeLH3 2024-11-03 SH_T11 -35.7836 -57.9402 1.1927 0.0503 29.3153
LittleHopeLH4 2024-11-03 E8_T01 -35.7836 -52.9096 0.9385 0.1271 24.5074
LittleHopeLH4 2024-11-03 E8_T02 -35.7836 -49.3875 1.1093 0.2420 55.1450
LittleHopeLH4 2024-11-03 E8_T03 -35.7836 -50.3266 0.8145 0.2655 44.4214
LittleHopeLH4 2024-11-03 E8_T04 -35.7836 -53.7886 0.8427 0.1156 20.0168
LittleHopeLH4 2024-11-03 E8_T05 -35.7836 -52.6659 1.0218 0.1235 25.9214
LittleHopeLH4 2024-11-03 E8_T06 -35.7836 -51.1831 0.7676 0.2313 36.4705
LittleHopeLH4 2024-11-03 E8_T07 -35.7836 -55.2482 0.4906 0.1419 14.3032
LittleHopeLH4 2024-11-03 E8_T08 -35.7836 -66.7668 0.1705 0.0288 1.0083

Eastern Shore

Summary

Table. Summary of the 2024 Eastern Shore spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Eastern Shore #1 2024-09-12 -35.9475 1 -35.13 729 292 40
Eastern Shore #2 2024-09-24 12 -36.0139 20 -46.33 6,832 309 16
Eastern Shore #3 2024-10-04 10 -35.7788 11 -39.84 7,799 2,851 65
Eastern Shore #4 2024-10-30 26 -35.8321 1 -49.24 32 16 56
Eastern Shore #5 2024-11-04 5 -35.7836 0 -43.44 38 33 86
Summary 7 -42.80 15,430 3,035 20

Length Frequency

Figure. Length distribution used for calculation of TS for the Eastern Shore acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Eastern Shore surveys in 2024 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2024 fish sampled for Eastern Shore by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Eastern Shore #1 Sep - 12 1 1 20 151 286 187 -35.4981 179 -35.4776
Eastern Shore #2 12 Sep - 24 7 2 31 916 300 209 -35.5644 170 -35.2590
Eastern Shore #3 10 Oct - 4 4 3 64 513 285 179 -35.3293 171 -35.2909
Eastern Shore #4 26 Oct - 30 1 1 23 115 295 194 -35.3827 170 -35.2546
Eastern Shore #5 6 Nov - 5 2 2 36 133 290 185 -35.3341 171 -35.2751

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2024 Eastern Shore acoustic surveys.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2024-09-12 ZP_T01 -35.9475 -50.2930 1.0353 0.2160 22.1796
EasternShoreES1 2024-09-12 ZP_T02 -35.9475 -39.7825 1.2010 2.0938 249.4644
EasternShoreES1 2024-09-12 ZP_T03 -35.9475 -38.8486 1.2864 2.4238 309.3131
EasternShoreES1 2024-09-12 ZP_T04 -35.9475 -42.0782 1.2778 1.1600 147.0421
EasternShoreES1 2024-09-12 ZP_T05 -35.9475 -63.8044 1.2807 0.0078 0.9881
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2024-09-24 SB_T01 -36.0139 -59.8183 3.3325 0.0461 84.3503
EasternShoreES1 2024-09-24 SB_T02 -36.0139 -57.7119 3.3167 0.0752 137.0007
EasternShoreES1 2024-09-24 SB_T03 -36.0139 -59.1076 3.1391 0.0576 99.3476
EasternShoreES1 2024-09-24 SB_T04 -36.0139 -58.4631 2.8991 0.0724 115.2406
EasternShoreES1 2024-09-24 SB_T05 -36.0139 -59.4699 2.6880 0.0619 91.3955
EasternShoreES1 2024-09-24 SB_T06 -36.0139 -53.9020 6.1746 0.0971 329.3974
EasternShoreES1 2024-09-24 SB_T07 -36.0139 -56.1183 4.5569 0.0790 197.7348
EasternShoreES1 2024-09-24 SB_T08 -36.0139 -52.3147 4.9732 0.1738 474.7275
EasternShoreES1 2024-09-24 SB_T09 -36.0139 -54.7313 2.7763 0.1785 272.1378
EasternShoreES1 2024-09-24 SB_T10 -36.0139 -59.9807 3.0249 0.0489 81.2547
EasternShoreES2 2024-09-24 EA_T04 -36.0139 -55.9205 0.5779 0.0628 4.8343
EasternShoreES2 2024-09-24 EA_T03 -36.0139 -47.1698 0.7203 0.3776 36.2584
EasternShoreES2 2024-09-24 EA_T02 -36.0139 -53.1372 1.2393 0.0555 9.1763
EasternShoreES2 2024-09-24 EA_T01 -36.0139 -63.2314 1.0120 0.0067 0.8979
EasternShoreES3 2024-09-24 EA_T05 -36.0139 -53.7941 0.5766 0.1201 9.4856
EasternShoreES3 2024-09-24 EA_T06 -36.0139 -43.1583 0.8738 0.9170 109.8091
EasternShoreES3 2024-09-24 EA_T07 -36.0139 -49.4211 0.8494 0.2230 25.9634
EasternShoreES3 2024-09-24 EA_T08 -36.0139 -60.8975 0.7475 0.0180 1.8481
EasternShoreES3 2024-09-24 EA_T09 -36.0139 -50.2580 0.7502 0.2083 21.4127
EasternShoreES3 2024-09-24 EA_T10 -36.0139 -46.3160 0.3542 1.0935 53.0730
EasternShoreES4 2024-09-24 KK_T02 -36.0139 -70.4481 0.8224 0.0010 0.1146
EasternShoreES4 2024-09-24 KK_T03 -36.0139 -67.9476 0.8643 0.0017 0.2037
EasternShoreES4 2024-09-24 KK_T01 -36.0139 -67.4445 0.5908 0.0028 0.2288
EasternShoreES5 2024-09-24 KK_T13 -36.0139 -73.6426 0.6555 0.0076 2.4501
EasternShoreES5 2024-09-24 KK_T12 -36.0139 -55.3074 2.2760 0.1498 166.9943
EasternShoreES5 2024-09-24 KK_T11 -36.0139 -53.7343 2.5037 0.1957 239.8899
EasternShoreES5 2024-09-24 KK_T10 -36.0139 -54.8213 2.6483 0.1440 186.7723
EasternShoreES5 2024-09-24 KK_T09 -36.0139 -53.3832 2.5697 0.2067 260.0918
EasternShoreES5 2024-09-24 KK_T08 -36.0139 -52.3546 3.1478 0.2138 329.5991
EasternShoreES5 2024-09-24 KK_T07 -36.0139 -52.1841 2.6052 0.2687 342.7996
EasternShoreES5 2024-09-24 KK_T06 -36.0139 -52.5126 4.3363 0.1497 317.8259
EasternShoreES5 2024-09-24 KK_T05 -36.0139 -49.9821 4.2505 0.2735 569.1684
EasternShoreES5 2024-09-24 KK_T04 -36.0139 -54.2248 3.9918 0.1096 214.2712
EasternShoreES6 2024-09-24 ZP_T11 -36.0139 -71.8060 0.4882 0.0166 2.0524
EasternShoreES6 2024-09-24 ZP_T12 -36.0139 -57.7082 1.6452 0.1269 52.7267
EasternShoreES6 2024-09-24 ZP_T13 -36.0139 -55.5512 1.4494 0.2367 86.6434
EasternShoreES6 2024-09-24 ZP_T14 -36.0139 -56.9102 1.5554 0.1613 63.3624
EasternShoreES6 2024-09-24 ZP_T15 -36.0139 -54.1023 1.7838 0.2685 120.9543
EasternShoreES6 2024-09-24 ZP_T16 -36.0139 -59.8649 1.4220 0.0894 32.0895
EasternShoreES6 2024-09-24 ZP_T17 -36.0139 -55.3984 1.3485 0.2636 89.7458
EasternShoreES6 2024-09-24 ZP_T18 -36.0139 -55.4271 1.7251 0.2047 89.1547
EasternShoreES6 2024-09-24 ZP_T19 -36.0139 -55.1180 1.0650 0.3560 95.7313
EasternShoreES6 2024-09-24 ZP_T20 -36.0139 -53.9816 1.1402 0.4319 124.3619
EasternShoreES6 2024-09-24 ZP_T21 -36.0139 -52.1971 1.0888 0.6822 187.5602
EasternShoreES6 2024-09-24 ZP_T22 -36.0139 -53.0037 1.8022 0.3423 155.7707
EasternShoreES6 2024-09-24 ZP_T23 -36.0139 -51.5512 1.4388 0.5991 217.6372
EasternShoreES6 2024-09-24 ZP_T24 -36.0139 -58.6111 0.7851 0.2160 42.8295
EasternShoreES6 2024-09-24 ZP_T25 -36.0139 -55.8172 0.5122 0.6302 81.4956
EasternShoreES6 2024-09-24 ZP_T26 -36.0139 -60.5664 0.4657 0.2322 27.3029
EasternShoreES6 2024-09-24 ZP_T10 -36.0139 -58.1729 1.1095 0.1691 47.3766
EasternShoreES6 2024-09-24 ZP_T09 -36.0139 -55.5075 1.1688 0.2965 87.5180
EasternShoreES6 2024-09-24 ZP_T08 -36.0139 -59.1020 1.2237 0.1238 38.2519
EasternShoreES6 2024-09-24 ZP_T07 -36.0139 -53.0589 1.1794 0.5165 153.8011
EasternShoreES6 2024-09-24 ZP_T06 -36.0139 -56.4957 1.0950 0.2521 69.7085
EasternShoreES6 2024-09-24 ZP_T05 -36.0139 -56.5851 1.1777 0.2296 68.2880
EasternShoreES6 2024-09-24 ZP_T04 -36.0139 -58.3922 1.4852 0.1201 45.0433
EasternShoreES6 2024-09-24 ZP_T03 -36.0139 -59.4592 1.1008 0.1268 35.2314
EasternShoreES6 2024-09-24 ZP_T02 -36.0139 -60.4324 1.0721 0.1040 28.1585
EasternShoreES6 2024-09-24 ZP_T01 -36.0139 -68.9739 0.5182 0.0301 3.9397
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2024-10-04 SB_T15 -35.7788 -76.5831 3.1552 0.0005 0.9251
EasternShoreES1 2024-10-04 SB_T16 -35.7788 -49.4107 3.4247 0.2407 482.3931
EasternShoreES1 2024-10-04 SB_T17 -35.7788 -40.5595 4.7208 1.3404 3,702.7620
EasternShoreES1 2024-10-04 SB_T18 -35.7788 -54.0691 4.3533 0.0648 165.0298
EasternShoreES1 2024-10-04 SB_T19 -35.7788 -64.3400 3.3716 0.0079 15.5052
EasternShoreES2 2024-10-04 KK_T02 -35.7788 -49.6654 0.3698 0.1626 13.5289
EasternShoreES2 2024-10-04 KK_T01 -35.7788 -41.0571 0.4277 1.0203 98.1948
EasternShoreES2 2024-10-04 KK_T03 -35.7788 -45.3476 0.3254 0.4994 36.5633
EasternShoreES2 2024-10-04 KK_T04 -35.7788 -68.4472 0.3484 0.0023 0.1791
EasternShoreES3 2024-10-04 KK_T05 -35.7788 -71.2758 1.0984 0.0014 0.3600
EasternShoreES3 2024-10-04 KK_T06 -35.7788 -40.1100 1.3509 1.4359 470.7963
EasternShoreES3 2024-10-04 KK_T07 -35.7788 -51.5806 1.4397 0.0960 33.5560
EasternShoreES3 2024-10-04 KK_T08 -35.7788 -51.4172 1.3696 0.1048 34.8425
EasternShoreES4 2024-10-04 KK_T12 -35.7788 -59.8605 0.4621 0.0196 1.1904
EasternShoreES4 2024-10-04 KK_T11 -35.7788 -46.3134 0.6359 0.3231 26.9414
EasternShoreES4 2024-10-04 KK_T10 -35.7788 -49.0148 0.8718 0.1265 14.4637
EasternShoreES4 2024-10-04 KK_T09 -35.7788 -57.1169 0.3537 0.0483 2.2391
EasternShoreES5 2024-10-04 KK_T16 -35.7788 -54.7744 0.5527 0.0486 4.3998
EasternShoreES5 2024-10-04 KK_T15 -35.7788 -42.4585 0.6967 0.6577 74.9947
EasternShoreES5 2024-10-04 KK_T14 -35.7788 -48.1211 0.5069 0.2454 20.3595
EasternShoreES5 2024-10-04 KK_T13 -35.7788 -46.9493 0.3771 0.4320 26.6652
EasternShoreES6 2024-10-04 ZP_T01 -35.7788 -74.1903 0.8779 0.0030 0.5772
EasternShoreES6 2024-10-04 ZP_T02 -35.7788 -71.1739 1.2451 0.0042 1.1561
EasternShoreES6 2024-10-04 ZP_T03 -35.7788 -49.7837 1.2383 0.5775 159.2243
EasternShoreES6 2024-10-04 ZP_T04 -35.7788 -44.1069 1.2392 2.1327 588.4198
EasternShoreES6 2024-10-04 ZP_T05 -35.7788 -48.9072 1.2467 0.7020 194.8320
EasternShoreES6 2024-10-04 ZP_T06 -35.7788 -43.8886 1.4555 1.9095 618.7497
EasternShoreES6 2024-10-04 ZP_T07 -35.7788 -46.3552 1.5234 1.0338 350.6341
EasternShoreES6 2024-10-04 ZP_T08 -35.7788 -47.4994 1.4715 0.8224 269.4233
EasternShoreES6 2024-10-04 ZP_T09 -35.7788 -50.2686 1.3419 0.4767 142.4008
EasternShoreES6 2024-10-04 ZP_T10 -35.7788 -51.7731 1.1559 0.3913 100.7077
EasternShoreES6 2024-10-04 ZP_T11 -35.7788 -56.3311 1.0151 0.1560 35.2584
EasternShoreES6 2024-10-04 ZP_T12 -35.7788 -59.7605 1.2123 0.0593 16.0078
EasternShoreES6 2024-10-04 ZP_T13 -35.7788 -54.6959 1.2016 0.1921 51.3788
EasternShoreES6 2024-10-04 ZP_T14 -35.7788 -59.8261 1.1587 0.0611 15.7675
EasternShoreES6 2024-10-04 ZP_T15 -35.7788 -75.2550 0.6019 0.0034 0.4517
EasternShoreES7 2024-10-04 ZP_T20 -35.7788 -61.1484 0.8600 0.0142 2.1765
EasternShoreES7 2024-10-04 ZP_T19 -35.7788 -54.6941 0.8568 0.0628 9.6201
EasternShoreES7 2024-10-04 ZP_T18 -35.7788 -59.4236 0.8993 0.0202 3.2376
EasternShoreES7 2024-10-04 ZP_T17 -35.7788 -54.6016 0.9777 0.0563 9.8271
EasternShoreES7 2024-10-04 ZP_T16 -35.7788 -59.6923 0.6008 0.0284 3.0434
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2024-10-30 KK_T01 -35.8321 -76.4915 0.7522 0.0003 0.0535
EasternShoreES1 2024-10-30 KK_T02 -35.8321 -56.6730 0.6850 0.0353 5.1294
EasternShoreES1 2024-10-30 KK_T03 -35.8321 -50.6106 0.8453 0.1156 20.7162
EasternShoreES1 2024-10-30 KK_T04 -35.8321 -59.7913 0.6542 0.0180 2.5017
EasternShoreES2 2024-10-30 ZP_T01 -35.8321 -77.1220 0.7432 0.0004 0.0234
EasternShoreES2 2024-10-30 ZP_T02 -35.8321 -70.7071 0.9788 0.0013 0.1027
EasternShoreES2 2024-10-30 ZP_T03 -35.8321 -68.3246 1.0031 0.0021 0.1777
EasternShoreES2 2024-10-30 ZP_T04 -35.8321 -55.8462 1.0727 0.0353 3.1442
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2024-11-04 KK_T04 -35.7836 -73.2067 0.4150 0.0007 0.0402
EasternShoreES1 2024-11-04 KK_T03 -35.7836 -72.5397 0.5302 0.0007 0.0468
EasternShoreES1 2024-11-04 KK_T02 -35.7836 -43.4506 0.4865 0.5934 37.9626
EasternShoreES1 2024-11-04 KK_T01 -35.7836 -92.4599 0.2554 0.0000 0.0005

Notes

About

This report was generated on: 2025-07-10 12:20:00.578395
dplyr R package version 1.1.4
kableExtra R package version 1.4.0
ggplot2 R package version 3.5.1
DT R package version 0.33
R version 4.4.2 (2024-10-31 ucrt)